Watch this video and answer the multi choices: https://www.youtube.com/watch?v=D4lB4SowAQA PART 1 _______1. Sociologists obtained their knowledge of human behavior through _______, which is this process of systematically collecting information for the purpose of testing an existing theory or generating a new one. a. Common sense ideas b. Research c. Myths d. scientific laws _______2. With ____Research, the goal is scientific objectivity, and the focus is on data that can be measured numerically a. qualitative b. observational c. c. quantitative d. d. explanatory _______3. With _______research, interpretative description (words) rather than statistics (numbers) are used to analyze underlying meaning and patterns of social relationships. a. qualitative b. observational c. quantitative d. explanatory _______4. Researchers in one study systematically analyzed the contents of the notes of suicide victims to determine recurring themes, such as feeling of despair or failure. They hoped to determine if any patterns could be found that would help in understating why people might kill themselves. This is an example of __________. a. Qualitative research b. Explanatory research c. Quantitative research d. Descriptive research ______5. the first step in the research process is to: a. select and define the research problem b. review previous research. c. develop a research design d. formulate the hypothesis ______6. A_____sample is a selection from a larger population and has the essential characteristics of the total population. a. selective b. random c. representative d. longitudinal _______7. _________is the extent to which a study or research instrument accurately measures what it is supposed to measure;_________is the extent to which a study or research instrument yields consistent results. a. Validity; replication b. Replication; validity c. Validity; reliability d. Reliability; validity _______8. Researchers who use existing material and analyze data that originally was collected by others are engaged in: a. unethical conduct b. primary analysis. c. secondary analysis d. survey analysis _______9. In an experiment, the subjects in the control group a. are exposed to the independent variable. b. are not exposed to the independent variable. c. are exposed to the dependent variable. d. are not exposed to the dependent variable. _______10. A tentative statement that predicts the relationship between variable is called a. a hypothesis b. a research model. c. a probability sample. d. a generalization. ______11. John wants to test this idea: “people who attend church regularly are less likely to express prejudice toward other races than people who do not attend church regularly.’ This idea is John’s a. hypothesis. b. research model. c. conclusion. d. operational definition _______12. In a research project, which of the following steps would come after the other three? a. choosing a research design b. reviewing the literature c. formulating a hypothesis d. collecting the data ________13. The variable hypothesized to cause or influence another is called the a. dependent variable. b. hypothetical variable c. correlation variable d. independent variable ________14. An explanation of an abstract concept that is specific enough to allow a research to measure the concept is a a. Hypothesis b. correlation. c. operatonal definition. d. variable _____15. Observation, ethnography, and case studies are examples of: a. survey research b. experiments. c. Secondary analysis of existing data. d. Field research. ______16. Theory and research are interrelated because a. theory always precedes research. b. research always precedes theory c. both put limits on each other. d. they are parts of a constant cycle. ______17. A dependent variable is one that a. always occurs first. b. is influenced by another variable. c. Causes another variable to change. d. is the most important ______18. In a study designed to test the relationship between gender and voting behavior, the independent variable would be a. the age of the candidates b. voting behavior. c. The political party of the candidates. d. Gender ______19. Differences in age, sex, race, and social class are treated as ____________in sociological research. a. variables b. references c. causes d. controls ______20. Researchers in agriculture decided to test the effects of a new fertilizer on crop growth. In this study, crop growth is the a. independent variable b. dependent variable c. control variable d. correlation e. _____21. The ______is appropriate for studying the relationships among variables under carefully controlled conditions. a. experiment b. survey c. observational study d. in-depth study _____22. In every experiment, some subjects are exposed to an independent variable, and are then watched closely for their reactions. These subjects are known as the a. reference group b. experimental group c. control group d. survey group. ______23. A usual research method for learning the attitudes of a population would be a. an experiment. b. A survey. c. An observational study. d. Content analysis ______24. In survey research, the total group of people the researcher is interested in is called a. the population b. the sample, c. the control group d. the random sample ______25. In the experiment method, the subjects who are exposed to all the experimental conditions except the independent variable are referred to as the_________________group. a. peer b. alternate c. control d. experimental ______26. A__________Sample is one in which every member of the population in The population has an equal chance of being selected. a. defined b. random c. purposive d. convenience ______27. A sociologist is following the research model outlined in the text. After reviewing the literature, the next step will be to a. find a suitable subject b. formulate a hypothesis c. collect the data. d. Choose a research design. ______28. Sociologists use two approaches when answering important questions. a. Explanatory and descriptive Approaches b. Direct and systematic Approaches c. Normative and systematic Approaches d. Normative and Empirical Approaches ______29. Sociologists use types of empirical studies a. Research and Theoretical Studies b. Descriptive and Explanatory Studies c. Hypothesis and Correlations Studies d. Longitudinal and Cross-sectional Studies ______30. The deductive approach begin with the a. Collecting data b. Theory and uses research to test the theory. c. Hypothesis d. Observation ______31. The inductive approach begin with a a. Theory b. Data Collection c. Reviewing the Literature d. The Problem State ______32. Quantitative Research deals with a. Words b. Numbers c. Interpretive descriptive d. Use number to analyze underlying meanings and patterns of social relationships. ______33. ________is the study of social life in its natural setting: observing and interviewing people where they live, work, and play. a. The survey b. Secondary analysis c. Field research d. The experiment ______34. ________refers to the process of collecting data while being part of the activities of the group that the researcher is studying a. The experiment b. Survey research c. Participant observation d. Secondary analysis _______35. A/an________is a detailed study of the life and activities of a group of people by researchers who may live with that group over a period of years. a. Correlational study b. ethnography c. experiment d. content analysis _______36. A/an _________is a carefully designed situation in which the researcher studies the impact of certain variables on subjects’ attitudes or behavior. a. case study b. correlational study c. experiment d. Participant observation _______37. In an experiment, the_______contains the subjects who are exposed to an independent variable to study its effect on them. a. Experiment group b. Dependent group c. Control group d. Independent group _______38. In an experiment, the_________contains the subjects who are not exposed to the independent variable. a. Experimental group b. Independent group c. Dependent group d. Control group _______39. ________is the extent to which a study or research instrument accurately measures what it is supposed to measure a. Validity b. Reliability c. Predictability d. Variability ______40. ________is the extent to which a study or research instrument yields consistent results when applied to different individual at one time or to same individuals over time. a. Validity b. Reliability c. Predictability d. Variability TRUE/FALSE ______41. In social science research, individuals are the most typical units of analysis. ______42. With qualitative research, statistics are used to analyze patterns of social relationship. ______43. Reliability is when a study gives consistent results to different research over time.

Watch this video and answer the multi choices: https://www.youtube.com/watch?v=D4lB4SowAQA PART 1 _______1. Sociologists obtained their knowledge of human behavior through _______, which is this process of systematically collecting information for the purpose of testing an existing theory or generating a new one. a. Common sense ideas b. Research c. Myths d. scientific laws _______2. With ____Research, the goal is scientific objectivity, and the focus is on data that can be measured numerically a. qualitative b. observational c. c. quantitative d. d. explanatory _______3. With _______research, interpretative description (words) rather than statistics (numbers) are used to analyze underlying meaning and patterns of social relationships. a. qualitative b. observational c. quantitative d. explanatory _______4. Researchers in one study systematically analyzed the contents of the notes of suicide victims to determine recurring themes, such as feeling of despair or failure. They hoped to determine if any patterns could be found that would help in understating why people might kill themselves. This is an example of __________. a. Qualitative research b. Explanatory research c. Quantitative research d. Descriptive research ______5. the first step in the research process is to: a. select and define the research problem b. review previous research. c. develop a research design d. formulate the hypothesis ______6. A_____sample is a selection from a larger population and has the essential characteristics of the total population. a. selective b. random c. representative d. longitudinal _______7. _________is the extent to which a study or research instrument accurately measures what it is supposed to measure;_________is the extent to which a study or research instrument yields consistent results. a. Validity; replication b. Replication; validity c. Validity; reliability d. Reliability; validity _______8. Researchers who use existing material and analyze data that originally was collected by others are engaged in: a. unethical conduct b. primary analysis. c. secondary analysis d. survey analysis _______9. In an experiment, the subjects in the control group a. are exposed to the independent variable. b. are not exposed to the independent variable. c. are exposed to the dependent variable. d. are not exposed to the dependent variable. _______10. A tentative statement that predicts the relationship between variable is called a. a hypothesis b. a research model. c. a probability sample. d. a generalization. ______11. John wants to test this idea: “people who attend church regularly are less likely to express prejudice toward other races than people who do not attend church regularly.’ This idea is John’s a. hypothesis. b. research model. c. conclusion. d. operational definition _______12. In a research project, which of the following steps would come after the other three? a. choosing a research design b. reviewing the literature c. formulating a hypothesis d. collecting the data ________13. The variable hypothesized to cause or influence another is called the a. dependent variable. b. hypothetical variable c. correlation variable d. independent variable ________14. An explanation of an abstract concept that is specific enough to allow a research to measure the concept is a a. Hypothesis b. correlation. c. operatonal definition. d. variable _____15. Observation, ethnography, and case studies are examples of: a. survey research b. experiments. c. Secondary analysis of existing data. d. Field research. ______16. Theory and research are interrelated because a. theory always precedes research. b. research always precedes theory c. both put limits on each other. d. they are parts of a constant cycle. ______17. A dependent variable is one that a. always occurs first. b. is influenced by another variable. c. Causes another variable to change. d. is the most important ______18. In a study designed to test the relationship between gender and voting behavior, the independent variable would be a. the age of the candidates b. voting behavior. c. The political party of the candidates. d. Gender ______19. Differences in age, sex, race, and social class are treated as ____________in sociological research. a. variables b. references c. causes d. controls ______20. Researchers in agriculture decided to test the effects of a new fertilizer on crop growth. In this study, crop growth is the a. independent variable b. dependent variable c. control variable d. correlation e. _____21. The ______is appropriate for studying the relationships among variables under carefully controlled conditions. a. experiment b. survey c. observational study d. in-depth study _____22. In every experiment, some subjects are exposed to an independent variable, and are then watched closely for their reactions. These subjects are known as the a. reference group b. experimental group c. control group d. survey group. ______23. A usual research method for learning the attitudes of a population would be a. an experiment. b. A survey. c. An observational study. d. Content analysis ______24. In survey research, the total group of people the researcher is interested in is called a. the population b. the sample, c. the control group d. the random sample ______25. In the experiment method, the subjects who are exposed to all the experimental conditions except the independent variable are referred to as the_________________group. a. peer b. alternate c. control d. experimental ______26. A__________Sample is one in which every member of the population in The population has an equal chance of being selected. a. defined b. random c. purposive d. convenience ______27. A sociologist is following the research model outlined in the text. After reviewing the literature, the next step will be to a. find a suitable subject b. formulate a hypothesis c. collect the data. d. Choose a research design. ______28. Sociologists use two approaches when answering important questions. a. Explanatory and descriptive Approaches b. Direct and systematic Approaches c. Normative and systematic Approaches d. Normative and Empirical Approaches ______29. Sociologists use types of empirical studies a. Research and Theoretical Studies b. Descriptive and Explanatory Studies c. Hypothesis and Correlations Studies d. Longitudinal and Cross-sectional Studies ______30. The deductive approach begin with the a. Collecting data b. Theory and uses research to test the theory. c. Hypothesis d. Observation ______31. The inductive approach begin with a a. Theory b. Data Collection c. Reviewing the Literature d. The Problem State ______32. Quantitative Research deals with a. Words b. Numbers c. Interpretive descriptive d. Use number to analyze underlying meanings and patterns of social relationships. ______33. ________is the study of social life in its natural setting: observing and interviewing people where they live, work, and play. a. The survey b. Secondary analysis c. Field research d. The experiment ______34. ________refers to the process of collecting data while being part of the activities of the group that the researcher is studying a. The experiment b. Survey research c. Participant observation d. Secondary analysis _______35. A/an________is a detailed study of the life and activities of a group of people by researchers who may live with that group over a period of years. a. Correlational study b. ethnography c. experiment d. content analysis _______36. A/an _________is a carefully designed situation in which the researcher studies the impact of certain variables on subjects’ attitudes or behavior. a. case study b. correlational study c. experiment d. Participant observation _______37. In an experiment, the_______contains the subjects who are exposed to an independent variable to study its effect on them. a. Experiment group b. Dependent group c. Control group d. Independent group _______38. In an experiment, the_________contains the subjects who are not exposed to the independent variable. a. Experimental group b. Independent group c. Dependent group d. Control group _______39. ________is the extent to which a study or research instrument accurately measures what it is supposed to measure a. Validity b. Reliability c. Predictability d. Variability ______40. ________is the extent to which a study or research instrument yields consistent results when applied to different individual at one time or to same individuals over time. a. Validity b. Reliability c. Predictability d. Variability TRUE/FALSE ______41. In social science research, individuals are the most typical units of analysis. ______42. With qualitative research, statistics are used to analyze patterns of social relationship. ______43. Reliability is when a study gives consistent results to different research over time.

info@checkyourstudy.com Watch this video and answer the multi choices:  https://www.youtube.com/watch?v=D4lB4SowAQA   … Read More...
Which of the following statements is CORRECT? One of the disadvantages of incorporating your business is that you could become subject to the firm’s liabilities in the event of bankruptcy. Sole proprietorships are subject to more regulations than corporations. In any partnership, every partner has the same rights, privileges, and liability exposure as every other partner. Corporations of all types are subject to the corporate income tax. Sole proprietorships and partnerships generally have a tax advantage over corporations.

Which of the following statements is CORRECT? One of the disadvantages of incorporating your business is that you could become subject to the firm’s liabilities in the event of bankruptcy. Sole proprietorships are subject to more regulations than corporations. In any partnership, every partner has the same rights, privileges, and liability exposure as every other partner. Corporations of all types are subject to the corporate income tax. Sole proprietorships and partnerships generally have a tax advantage over corporations.

Which of the following statements is CORRECT? One of the … Read More...
Chapter 9 Practice Problems (Practice – no credit) Due: 11:59pm on Friday, April 18, 2014 You will receive no credit for items you complete after the assignment is due. Grading Policy Momentum and Internal Forces Learning Goal: To understand the concept of total momentum for a system of objects and the effect of the internal forces on the total momentum. We begin by introducing the following terms: System: Any collection of objects, either pointlike or extended. In many momentum-related problems, you have a certain freedom in choosing the objects to be considered as your system. Making a wise choice is often a crucial step in solving the problem. Internal force: Any force interaction between two objects belonging to the chosen system. Let us stress that both interacting objects must belong to the system. External force: Any force interaction between objects at least one of which does not belong to the chosen system; in other words, at least one of the objects is external to the system. Closed system: a system that is not subject to any external forces. Total momentum: The vector sum of the individual momenta of all objects constituting the system. In this problem, you will analyze a system composed of two blocks, 1 and 2, of respective masses and . To simplify the analysis, we will make several assumptions: The blocks can move in only one dimension, namely, 1. along the x axis. 2. The masses of the blocks remain constant. 3. The system is closed. At time , the x components of the velocity and the acceleration of block 1 are denoted by and . Similarly, the x components of the velocity and acceleration of block 2 are denoted by and . In this problem, you will show that the total momentum of the system is not changed by the presence of internal forces. m1 m2 t v1(t) a1 (t) v2 (t) a2 (t) Part A Find , the x component of the total momentum of the system at time . Express your answer in terms of , , , and . ANSWER: Part B Find the time derivative of the x component of the system’s total momentum. Express your answer in terms of , , , and . You did not open hints for this part. ANSWER: Why did we bother with all this math? The expression for the derivative of momentum that we just obtained will be useful in reaching our desired conclusion, if only for this very special case. Part C The quantity (mass times acceleration) is dimensionally equivalent to which of the following? ANSWER: p(t) t m1 m2 v1 (t) v2 (t) p(t) = dp(t)/dt a1 (t) a2 (t) m1 m2 dp(t)/dt = ma Part D Acceleration is due to which of the following physical quantities? ANSWER: Part E Since we have assumed that the system composed of blocks 1 and 2 is closed, what could be the reason for the acceleration of block 1? You did not open hints for this part. ANSWER: momentum energy force acceleration inertia velocity speed energy momentum force Part F This question will be shown after you complete previous question(s). Part G Let us denote the x component of the force exerted by block 1 on block 2 by , and the x component of the force exerted by block 2 on block 1 by . Which of the following pairs equalities is a direct consequence of Newton’s second law? ANSWER: Part H Let us recall that we have denoted the force exerted by block 1 on block 2 by , and the force exerted by block 2 on block 1 by . If we suppose that is greater than , which of the following statements about forces is true? You did not open hints for this part. the large mass of block 1 air resistance Earth’s gravitational attraction a force exerted by block 2 on block 1 a force exerted by block 1 on block 2 F12 F21 and and and and F12 = m2a2 F21 = m1a1 F12 = m1a1 F21 = m2a2 F12 = m1a2 F21 = m2a1 F12 = m2a1 F21 = m1a2 F12 F21 m1 m2 ANSWER: Part I Now recall the expression for the time derivative of the x component of the system’s total momentum: . Considering the information that you now have, choose the best alternative for an equivalent expression to . You did not open hints for this part. ANSWER: Impulse and Momentum Ranking Task Six automobiles are initially traveling at the indicated velocities. The automobiles have different masses and velocities. The drivers step on the brakes and all automobiles are brought to rest. Part A Rank these automobiles based on the magnitude of their momentum before the brakes are applied, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. ANSWER: Both forces have equal magnitudes. |F12 | > |F21| |F21 | > |F12| dpx(t)/dt = Fx dpx(t)/dt 0 nonzero constant kt kt2 Part B Rank these automobiles based on the magnitude of the impulse needed to stop them, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. You did not open hints for this part. ANSWER: Part C Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. You did not open hints for this part. ANSWER: A Game of Frictionless Catch Chuck and Jackie stand on separate carts, both of which can slide without friction. The combined mass of Chuck and his cart, , is identical to the combined mass of Jackie and her cart. Initially, Chuck and Jackie and their carts are at rest. Chuck then picks up a ball of mass and throws it to Jackie, who catches it. Assume that the ball travels in a straight line parallel to the ground (ignore the effect of gravity). After Chuck throws the ball, his speed relative to the ground is . The speed of the thrown ball relative to the ground is . Jackie catches the ball when it reaches her, and she and her cart begin to move. Jackie’s speed relative to the ground after she catches the ball is . When answering the questions in this problem, keep the following in mind: The original mass of Chuck and his cart does not include the 1. mass of the ball. 2. The speed of an object is the magnitude of its velocity. An object’s speed will always be a nonnegative quantity. mcart mball vc vb vj mcart Part A Find the relative speed between Chuck and the ball after Chuck has thrown the ball. Express the speed in terms of and . You did not open hints for this part. ANSWER: Part B What is the speed of the ball (relative to the ground) while it is in the air? Express your answer in terms of , , and . You did not open hints for this part. ANSWER: Part C What is Chuck’s speed (relative to the ground) after he throws the ball? Express your answer in terms of , , and . u vc vb u = vb mball mcart u vb = vc mball mcart u You did not open hints for this part. ANSWER: Part D Find Jackie’s speed (relative to the ground) after she catches the ball, in terms of . Express in terms of , , and . You did not open hints for this part. ANSWER: Part E Find Jackie’s speed (relative to the ground) after she catches the ball, in terms of . Express in terms of , , and . You did not open hints for this part. ANSWER: vc = vj vb vj mball mcart vb vj = vj u vj mball mcart u Momentum in an Explosion A giant “egg” explodes as part of a fireworks display. The egg is at rest before the explosion, and after the explosion, it breaks into two pieces, with the masses indicated in the diagram, traveling in opposite directions. Part A What is the momentum of piece A before the explosion? Express your answer numerically in kilogram meters per second. You did not open hints for this part. ANSWER: vj = pA,i Part B During the explosion, is the force of piece A on piece B greater than, less than, or equal to the force of piece B on piece A? You did not open hints for this part. ANSWER: Part C The momentum of piece B is measured to be 500 after the explosion. Find the momentum of piece A after the explosion. Enter your answer numerically in kilogram meters per second. You did not open hints for this part. ANSWER: pA,i = kg  m/s greater than less than equal to cannot be determined kg  m/s pA,f pA,f = kg  m/s ± PSS 9.1 Conservation of Momentum Learning Goal: To practice Problem-Solving Strategy 9.1 for conservation of momentum problems. An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backward just after releasing the ball? PROBLEM-SOLVING STRATEGY 9.1 Conservation of momentum MODEL: Clearly define the system. If possible, choose a system that is isolated ( ) or within which the interactions are sufficiently short and intense that you can ignore external forces for the duration of the interaction (the impulse approximation). Momentum is conserved. If it is not possible to choose an isolated system, try to divide the problem into parts such that momentum is conserved during one segment of the motion. Other segments of the motion can be analyzed using Newton’s laws or, as you will learn later, conservation of energy. VISUALIZE: Draw a before-and-after pictorial representation. Define symbols that will be used in the problem, list known values, and identify what you are trying to find. SOLVE: The mathematical representation is based on the law of conservation of momentum: . In component form, this is ASSESS: Check that your result has the correct units, is reasonable, and answers the question. Model The interaction at study in this problem is the action of throwing the ball, performed by the quarterback while being off the ground. To apply conservation of momentum to this interaction, you will need to clearly define a system that is isolated or within which the impulse approximation can be applied. Part A Sort the following objects as part of the system or not. Drag the appropriate objects to their respective bins. ANSWER: kg kg m/s F = net 0 P = f P  i (pfx + ( + ( += ( + ( + ( + )1 pfx)2 pfx)3 pix)1 pix)2 pix)3 (pfy + ( + ( += ( + ( + ( + )1 pfy)2 pfy)3 piy)1 piy)2 piy)3 Part B This question will be shown after you complete previous question(s). Visualize Solve Part C This question will be shown after you complete previous question(s). Assess Part D This question will be shown after you complete previous question(s). Conservation of Momentum in Inelastic Collisions Learning Goal: To understand the vector nature of momentum in the case in which two objects collide and stick together. In this problem we will consider a collision of two moving objects such that after the collision, the objects stick together and travel off as a single unit. The collision is therefore completely inelastic. You have probably learned that “momentum is conserved” in an inelastic collision. But how does this fact help you to solve collision problems? The following questions should help you to clarify the meaning and implications of the statement “momentum is conserved.” Part A What physical quantities are conserved in this collision? ANSWER: Part B Two cars of equal mass collide inelastically and stick together after the collision. Before the collision, their speeds are and . What is the speed of the two-car system after the collision? the magnitude of the momentum only the net momentum (considered as a vector) only the momentum of each object considered individually v1 v2 You did not open hints for this part. ANSWER: Part C Two cars collide inelastically and stick together after the collision. Before the collision, the magnitudes of their momenta are and . After the collision, what is the magnitude of their combined momentum? You did not open hints for this part. ANSWER: The answer depends on the directions in which the cars were moving before the collision. v1 + v2 v1 − v2 v2 − v1 v1v2 −−−− ” v1+v2 2 v1 + 2 v2 2 −−−−−−−  p1 p2 Part D Two cars collide inelastically and stick together after the collision. Before the collision, their momenta are and . After the collision, their combined momentum is . Of what can one be certain? You did not open hints for this part. ANSWER: Part E Two cars collide inelastically and stick together after the collision. Before the collision, the magnitudes of their momenta are and . After the collision, the magnitude of their combined momentum is . Of what can one be certain? The answer depends on the directions in which the cars were moving before the collision. p1 + p2 p1 − p2 p2 − p1 p1p2 −−−− ” p1+p2 2 p1 + 2 p2 2 −−−−−−−  p 1 p 2 p p = p1 + # p2 # p = p1 − # p2 # p = p2 − # p1 # p1 p2 p You did not open hints for this part. ANSWER: Colliding Cars In this problem we will consider the collision of two cars initially moving at right angles. We assume that after the collision the cars stick together and travel off as a single unit. The collision is therefore completely inelastic. Two cars of masses and collide at an intersection. Before the collision, car 1 was traveling eastward at a speed of , and car 2 was traveling northward at a speed of . After the collision, the two cars stick together and travel off in the direction shown. Part A p1 + p2 $ p $ p1p2 −−−− ” p1 +p2 $ p $ p1+p2 2 p1 + p2 $ p $ |p1 − p2 | p1 + p2 $ p $ p1 + 2 p2 2 −−−−−−−  m1 m2 v1 v2 First, find the magnitude of , that is, the speed of the two-car unit after the collision. Express in terms of , , and the cars’ initial speeds and . You did not open hints for this part. ANSWER: Part B Find the tangent of the angle . Express your answer in terms of the momenta of the two cars, and . ANSWER: Part C Suppose that after the collision, ; in other words, is . This means that before the collision: ANSWER: v v v m1 m2 v1 v2 v = p1 p2 tan( ) = tan = 1 45′ The magnitudes of the momenta of the cars were equal. The masses of the cars were equal. The velocities of the cars were equal. ± Catching a Ball on Ice Olaf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400 that is traveling horizontally at 11.2 . Olaf’s mass is 67.1 . Part A If Olaf catches the ball, with what speed do Olaf and the ball move afterward? Express your answer numerically in meters per second. You did not open hints for this part. ANSWER: Part B kg m/s kg vf vf = m/s If the ball hits Olaf and bounces off his chest horizontally at 8.00 in the opposite direction, what is his speed after the collision? Express your answer numerically in meters per second. You did not open hints for this part. ANSWER: A One-Dimensional Inelastic Collision Block 1, of mass = 2.90 , moves along a frictionless air track with speed = 25.0 . It collides with block 2, of mass = 17.0 , which was initially at rest. The blocks stick together after the collision. Part A Find the magnitude of the total initial momentum of the two-block system. Express your answer numerically. m/s vf vf = m/s m1 kg v1 m/s m2 kg pi You did not open hints for this part. ANSWER: Part B Find , the magnitude of the final velocity of the two-block system. Express your answer numerically. You did not open hints for this part. ANSWER: Score Summary: Your score on this assignment is 0%. You received 0 out of a possible total of 0 points. pi = kg  m/s vf vf = m/s

Chapter 9 Practice Problems (Practice – no credit) Due: 11:59pm on Friday, April 18, 2014 You will receive no credit for items you complete after the assignment is due. Grading Policy Momentum and Internal Forces Learning Goal: To understand the concept of total momentum for a system of objects and the effect of the internal forces on the total momentum. We begin by introducing the following terms: System: Any collection of objects, either pointlike or extended. In many momentum-related problems, you have a certain freedom in choosing the objects to be considered as your system. Making a wise choice is often a crucial step in solving the problem. Internal force: Any force interaction between two objects belonging to the chosen system. Let us stress that both interacting objects must belong to the system. External force: Any force interaction between objects at least one of which does not belong to the chosen system; in other words, at least one of the objects is external to the system. Closed system: a system that is not subject to any external forces. Total momentum: The vector sum of the individual momenta of all objects constituting the system. In this problem, you will analyze a system composed of two blocks, 1 and 2, of respective masses and . To simplify the analysis, we will make several assumptions: The blocks can move in only one dimension, namely, 1. along the x axis. 2. The masses of the blocks remain constant. 3. The system is closed. At time , the x components of the velocity and the acceleration of block 1 are denoted by and . Similarly, the x components of the velocity and acceleration of block 2 are denoted by and . In this problem, you will show that the total momentum of the system is not changed by the presence of internal forces. m1 m2 t v1(t) a1 (t) v2 (t) a2 (t) Part A Find , the x component of the total momentum of the system at time . Express your answer in terms of , , , and . ANSWER: Part B Find the time derivative of the x component of the system’s total momentum. Express your answer in terms of , , , and . You did not open hints for this part. ANSWER: Why did we bother with all this math? The expression for the derivative of momentum that we just obtained will be useful in reaching our desired conclusion, if only for this very special case. Part C The quantity (mass times acceleration) is dimensionally equivalent to which of the following? ANSWER: p(t) t m1 m2 v1 (t) v2 (t) p(t) = dp(t)/dt a1 (t) a2 (t) m1 m2 dp(t)/dt = ma Part D Acceleration is due to which of the following physical quantities? ANSWER: Part E Since we have assumed that the system composed of blocks 1 and 2 is closed, what could be the reason for the acceleration of block 1? You did not open hints for this part. ANSWER: momentum energy force acceleration inertia velocity speed energy momentum force Part F This question will be shown after you complete previous question(s). Part G Let us denote the x component of the force exerted by block 1 on block 2 by , and the x component of the force exerted by block 2 on block 1 by . Which of the following pairs equalities is a direct consequence of Newton’s second law? ANSWER: Part H Let us recall that we have denoted the force exerted by block 1 on block 2 by , and the force exerted by block 2 on block 1 by . If we suppose that is greater than , which of the following statements about forces is true? You did not open hints for this part. the large mass of block 1 air resistance Earth’s gravitational attraction a force exerted by block 2 on block 1 a force exerted by block 1 on block 2 F12 F21 and and and and F12 = m2a2 F21 = m1a1 F12 = m1a1 F21 = m2a2 F12 = m1a2 F21 = m2a1 F12 = m2a1 F21 = m1a2 F12 F21 m1 m2 ANSWER: Part I Now recall the expression for the time derivative of the x component of the system’s total momentum: . Considering the information that you now have, choose the best alternative for an equivalent expression to . You did not open hints for this part. ANSWER: Impulse and Momentum Ranking Task Six automobiles are initially traveling at the indicated velocities. The automobiles have different masses and velocities. The drivers step on the brakes and all automobiles are brought to rest. Part A Rank these automobiles based on the magnitude of their momentum before the brakes are applied, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. ANSWER: Both forces have equal magnitudes. |F12 | > |F21| |F21 | > |F12| dpx(t)/dt = Fx dpx(t)/dt 0 nonzero constant kt kt2 Part B Rank these automobiles based on the magnitude of the impulse needed to stop them, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. You did not open hints for this part. ANSWER: Part C Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. You did not open hints for this part. ANSWER: A Game of Frictionless Catch Chuck and Jackie stand on separate carts, both of which can slide without friction. The combined mass of Chuck and his cart, , is identical to the combined mass of Jackie and her cart. Initially, Chuck and Jackie and their carts are at rest. Chuck then picks up a ball of mass and throws it to Jackie, who catches it. Assume that the ball travels in a straight line parallel to the ground (ignore the effect of gravity). After Chuck throws the ball, his speed relative to the ground is . The speed of the thrown ball relative to the ground is . Jackie catches the ball when it reaches her, and she and her cart begin to move. Jackie’s speed relative to the ground after she catches the ball is . When answering the questions in this problem, keep the following in mind: The original mass of Chuck and his cart does not include the 1. mass of the ball. 2. The speed of an object is the magnitude of its velocity. An object’s speed will always be a nonnegative quantity. mcart mball vc vb vj mcart Part A Find the relative speed between Chuck and the ball after Chuck has thrown the ball. Express the speed in terms of and . You did not open hints for this part. ANSWER: Part B What is the speed of the ball (relative to the ground) while it is in the air? Express your answer in terms of , , and . You did not open hints for this part. ANSWER: Part C What is Chuck’s speed (relative to the ground) after he throws the ball? Express your answer in terms of , , and . u vc vb u = vb mball mcart u vb = vc mball mcart u You did not open hints for this part. ANSWER: Part D Find Jackie’s speed (relative to the ground) after she catches the ball, in terms of . Express in terms of , , and . You did not open hints for this part. ANSWER: Part E Find Jackie’s speed (relative to the ground) after she catches the ball, in terms of . Express in terms of , , and . You did not open hints for this part. ANSWER: vc = vj vb vj mball mcart vb vj = vj u vj mball mcart u Momentum in an Explosion A giant “egg” explodes as part of a fireworks display. The egg is at rest before the explosion, and after the explosion, it breaks into two pieces, with the masses indicated in the diagram, traveling in opposite directions. Part A What is the momentum of piece A before the explosion? Express your answer numerically in kilogram meters per second. You did not open hints for this part. ANSWER: vj = pA,i Part B During the explosion, is the force of piece A on piece B greater than, less than, or equal to the force of piece B on piece A? You did not open hints for this part. ANSWER: Part C The momentum of piece B is measured to be 500 after the explosion. Find the momentum of piece A after the explosion. Enter your answer numerically in kilogram meters per second. You did not open hints for this part. ANSWER: pA,i = kg  m/s greater than less than equal to cannot be determined kg  m/s pA,f pA,f = kg  m/s ± PSS 9.1 Conservation of Momentum Learning Goal: To practice Problem-Solving Strategy 9.1 for conservation of momentum problems. An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backward just after releasing the ball? PROBLEM-SOLVING STRATEGY 9.1 Conservation of momentum MODEL: Clearly define the system. If possible, choose a system that is isolated ( ) or within which the interactions are sufficiently short and intense that you can ignore external forces for the duration of the interaction (the impulse approximation). Momentum is conserved. If it is not possible to choose an isolated system, try to divide the problem into parts such that momentum is conserved during one segment of the motion. Other segments of the motion can be analyzed using Newton’s laws or, as you will learn later, conservation of energy. VISUALIZE: Draw a before-and-after pictorial representation. Define symbols that will be used in the problem, list known values, and identify what you are trying to find. SOLVE: The mathematical representation is based on the law of conservation of momentum: . In component form, this is ASSESS: Check that your result has the correct units, is reasonable, and answers the question. Model The interaction at study in this problem is the action of throwing the ball, performed by the quarterback while being off the ground. To apply conservation of momentum to this interaction, you will need to clearly define a system that is isolated or within which the impulse approximation can be applied. Part A Sort the following objects as part of the system or not. Drag the appropriate objects to their respective bins. ANSWER: kg kg m/s F = net 0 P = f P  i (pfx + ( + ( += ( + ( + ( + )1 pfx)2 pfx)3 pix)1 pix)2 pix)3 (pfy + ( + ( += ( + ( + ( + )1 pfy)2 pfy)3 piy)1 piy)2 piy)3 Part B This question will be shown after you complete previous question(s). Visualize Solve Part C This question will be shown after you complete previous question(s). Assess Part D This question will be shown after you complete previous question(s). Conservation of Momentum in Inelastic Collisions Learning Goal: To understand the vector nature of momentum in the case in which two objects collide and stick together. In this problem we will consider a collision of two moving objects such that after the collision, the objects stick together and travel off as a single unit. The collision is therefore completely inelastic. You have probably learned that “momentum is conserved” in an inelastic collision. But how does this fact help you to solve collision problems? The following questions should help you to clarify the meaning and implications of the statement “momentum is conserved.” Part A What physical quantities are conserved in this collision? ANSWER: Part B Two cars of equal mass collide inelastically and stick together after the collision. Before the collision, their speeds are and . What is the speed of the two-car system after the collision? the magnitude of the momentum only the net momentum (considered as a vector) only the momentum of each object considered individually v1 v2 You did not open hints for this part. ANSWER: Part C Two cars collide inelastically and stick together after the collision. Before the collision, the magnitudes of their momenta are and . After the collision, what is the magnitude of their combined momentum? You did not open hints for this part. ANSWER: The answer depends on the directions in which the cars were moving before the collision. v1 + v2 v1 − v2 v2 − v1 v1v2 −−−− ” v1+v2 2 v1 + 2 v2 2 −−−−−−−  p1 p2 Part D Two cars collide inelastically and stick together after the collision. Before the collision, their momenta are and . After the collision, their combined momentum is . Of what can one be certain? You did not open hints for this part. ANSWER: Part E Two cars collide inelastically and stick together after the collision. Before the collision, the magnitudes of their momenta are and . After the collision, the magnitude of their combined momentum is . Of what can one be certain? The answer depends on the directions in which the cars were moving before the collision. p1 + p2 p1 − p2 p2 − p1 p1p2 −−−− ” p1+p2 2 p1 + 2 p2 2 −−−−−−−  p 1 p 2 p p = p1 + # p2 # p = p1 − # p2 # p = p2 − # p1 # p1 p2 p You did not open hints for this part. ANSWER: Colliding Cars In this problem we will consider the collision of two cars initially moving at right angles. We assume that after the collision the cars stick together and travel off as a single unit. The collision is therefore completely inelastic. Two cars of masses and collide at an intersection. Before the collision, car 1 was traveling eastward at a speed of , and car 2 was traveling northward at a speed of . After the collision, the two cars stick together and travel off in the direction shown. Part A p1 + p2 $ p $ p1p2 −−−− ” p1 +p2 $ p $ p1+p2 2 p1 + p2 $ p $ |p1 − p2 | p1 + p2 $ p $ p1 + 2 p2 2 −−−−−−−  m1 m2 v1 v2 First, find the magnitude of , that is, the speed of the two-car unit after the collision. Express in terms of , , and the cars’ initial speeds and . You did not open hints for this part. ANSWER: Part B Find the tangent of the angle . Express your answer in terms of the momenta of the two cars, and . ANSWER: Part C Suppose that after the collision, ; in other words, is . This means that before the collision: ANSWER: v v v m1 m2 v1 v2 v = p1 p2 tan( ) = tan = 1 45′ The magnitudes of the momenta of the cars were equal. The masses of the cars were equal. The velocities of the cars were equal. ± Catching a Ball on Ice Olaf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400 that is traveling horizontally at 11.2 . Olaf’s mass is 67.1 . Part A If Olaf catches the ball, with what speed do Olaf and the ball move afterward? Express your answer numerically in meters per second. You did not open hints for this part. ANSWER: Part B kg m/s kg vf vf = m/s If the ball hits Olaf and bounces off his chest horizontally at 8.00 in the opposite direction, what is his speed after the collision? Express your answer numerically in meters per second. You did not open hints for this part. ANSWER: A One-Dimensional Inelastic Collision Block 1, of mass = 2.90 , moves along a frictionless air track with speed = 25.0 . It collides with block 2, of mass = 17.0 , which was initially at rest. The blocks stick together after the collision. Part A Find the magnitude of the total initial momentum of the two-block system. Express your answer numerically. m/s vf vf = m/s m1 kg v1 m/s m2 kg pi You did not open hints for this part. ANSWER: Part B Find , the magnitude of the final velocity of the two-block system. Express your answer numerically. You did not open hints for this part. ANSWER: Score Summary: Your score on this assignment is 0%. You received 0 out of a possible total of 0 points. pi = kg  m/s vf vf = m/s

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“How to Date a Black girl, Brown girl, Halfie or White girl” written by Junot Diaz

“How to Date a Black girl, Brown girl, Halfie or White girl” written by Junot Diaz

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Annotated Bibliography Annotated Bibliography. For each of the tasks which are undertaken as part of this portfolio you will normally be expected to “read round” the subject area. It isn’t really sufficient just to read the relevant chapter in the textbook; you will also find information in periodicals, magazines, quality newspapers etc etc and certainly by searching the Internet. Just as in any other assignment in UWBS you are expected to identify your sources in a bibliography using Harvard referencing. An annotated bibliography is the same as a conventional bibliography but includes comments on what you found particularly useful in each of the texts that you cite. On this page you will present your annotated bibliography. You can either write the assignment here or upload it as a word document. Some of you may be using Endnote in preparation your dissertation, and in that case you could create a new endnote library for this assignment and then upload the bibliography from that endnote library. During the briefing sessions you will be shown how to upload a file and create a link. You can also find help if you click on the large ? on the Pebble beach opening page. Once you have finished, delete the red text.

Annotated Bibliography Annotated Bibliography. For each of the tasks which are undertaken as part of this portfolio you will normally be expected to “read round” the subject area. It isn’t really sufficient just to read the relevant chapter in the textbook; you will also find information in periodicals, magazines, quality newspapers etc etc and certainly by searching the Internet. Just as in any other assignment in UWBS you are expected to identify your sources in a bibliography using Harvard referencing. An annotated bibliography is the same as a conventional bibliography but includes comments on what you found particularly useful in each of the texts that you cite. On this page you will present your annotated bibliography. You can either write the assignment here or upload it as a word document. Some of you may be using Endnote in preparation your dissertation, and in that case you could create a new endnote library for this assignment and then upload the bibliography from that endnote library. During the briefing sessions you will be shown how to upload a file and create a link. You can also find help if you click on the large ? on the Pebble beach opening page. Once you have finished, delete the red text.

Annotated Bibliography:   Mayaavi.com, (2015). Strategy, Innovation and Entrepreneurship: : … Read More...
Chapter 9 Practice Problems (Practice – no credit) Due: 11:59pm on Friday, April 18, 2014 You will receive no credit for items you complete after the assignment is due. Grading Policy Momentum and Internal Forces Learning Goal: To understand the concept of total momentum for a system of objects and the effect of the internal forces on the total momentum. We begin by introducing the following terms: System: Any collection of objects, either pointlike or extended. In many momentum-related problems, you have a certain freedom in choosing the objects to be considered as your system. Making a wise choice is often a crucial step in solving the problem. Internal force: Any force interaction between two objects belonging to the chosen system. Let us stress that both interacting objects must belong to the system. External force: Any force interaction between objects at least one of which does not belong to the chosen system; in other words, at least one of the objects is external to the system. Closed system: a system that is not subject to any external forces. Total momentum: The vector sum of the individual momenta of all objects constituting the system. In this problem, you will analyze a system composed of two blocks, 1 and 2, of respective masses and . To simplify the analysis, we will make several assumptions: The blocks can move in only one dimension, namely, 1. along the x axis. 2. The masses of the blocks remain constant. 3. The system is closed. At time , the x components of the velocity and the acceleration of block 1 are denoted by and . Similarly, the x components of the velocity and acceleration of block 2 are denoted by and . In this problem, you will show that the total momentum of the system is not changed by the presence of internal forces. m1 m2 t v1(t) a1 (t) v2 (t) a2 (t)

Chapter 9 Practice Problems (Practice – no credit) Due: 11:59pm on Friday, April 18, 2014 You will receive no credit for items you complete after the assignment is due. Grading Policy Momentum and Internal Forces Learning Goal: To understand the concept of total momentum for a system of objects and the effect of the internal forces on the total momentum. We begin by introducing the following terms: System: Any collection of objects, either pointlike or extended. In many momentum-related problems, you have a certain freedom in choosing the objects to be considered as your system. Making a wise choice is often a crucial step in solving the problem. Internal force: Any force interaction between two objects belonging to the chosen system. Let us stress that both interacting objects must belong to the system. External force: Any force interaction between objects at least one of which does not belong to the chosen system; in other words, at least one of the objects is external to the system. Closed system: a system that is not subject to any external forces. Total momentum: The vector sum of the individual momenta of all objects constituting the system. In this problem, you will analyze a system composed of two blocks, 1 and 2, of respective masses and . To simplify the analysis, we will make several assumptions: The blocks can move in only one dimension, namely, 1. along the x axis. 2. The masses of the blocks remain constant. 3. The system is closed. At time , the x components of the velocity and the acceleration of block 1 are denoted by and . Similarly, the x components of the velocity and acceleration of block 2 are denoted by and . In this problem, you will show that the total momentum of the system is not changed by the presence of internal forces. m1 m2 t v1(t) a1 (t) v2 (t) a2 (t)

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ENGR216: Mechanics and Vibrations Tutorial sheet 1 Michaelmas Term AY 2015/2016 Problems will be solved in class in week 5 PROBLEM 1 A rod of length L, cross-sectional area A1, and modulus of elasticity E1 has been placed inside a tube of the same length L, but of cross-sectional area A2 and modulus of elasticity E2. A force P is applied on a rigid plate attached to both tube and rod, as shown in the sketch below. Determine: a) the horizontal displacement of the rigid plate; b) the fixed support reactions acting on the rod and tube when E1=E2; c) the fixed support reactions acting on the rod and tube when E1=2E2; HINT: deformation of tube and rod is constrained to be the same. PROBLEM 2 A steel beam has a rectangular cross section of height lx=20 mm and width ly=30 mm, and length lz=1 m (lengths lx, ly and lz are measured respectively along x, y and z axes of a Cartesian system). The material of the beam has Young modulus E=200 GPa, Poisson ratio ν=0.29, and maximum allowable normal stress of 175 MPa. The beam is subject to a compressive centric axial load Pz of 80 KN applied at its ends (load acts along z axis). a) State whether the area of the cross section of the beam will increase or decrease under the effect of the applied centric axial load and explain why. b) Determine the variation of the section height lx in mm, indicating if such variation is a contraction or an elongation. c) Determine the maximum axial load (Pz)max applicable to the beam and the maximum shear stress in these conditions. d) In the loading condition (c), state whether the uniformly distributed normal load to be applied on the beam faces normal to the x axis leading to a zero variation of the section height lx is compressive or tensile and justify your answer. e) In the loading condition (c), determine the magnitude of the uniformly distributed normal load to be applied on the beam faces normal to the x axis resulting in zero variation of the section height lx. f) After application of the uniformly distributed normal load, determine the bulk modulus and the beam dilatation indicating its sign. PROBLEM 3 A beam has a constant circular cross section of radius 20 mm, and is subject to a tensile axial load of 4 KN. a) Determine the magnitude of the maximum stress in the cross section when the axial load is applied at the centre of the section. b) In the loading condition (a), state whether a neutral axis exists or not, and explain why. c) State whether the maximum stress in the cross section when the axial load is applied at 10 mm from the centre of the section is compressive or tensile and explain why. d) In the loading condition (c), determine the magnitude of the maximum compressive and tensile stresses in the cross section. e) In the loading condition (c), determine the distance of the neutral axis from the centre of the cross section. PROBLEM 4 Consider a simply supported beam subject to the distributed load sketched below. a) Determine the equations of shear force V(x) and bending-moment M(x); b) plot V(x) and M(x) along the beam axis; c) assuming the cross section is square and has length a , determine the position along the beam where the maximum normal stress occurs and the value of such maximum normal stress; d) determine the position along the beam where the maximum shear stress occurs and the value of such maximum shear stress.

ENGR216: Mechanics and Vibrations Tutorial sheet 1 Michaelmas Term AY 2015/2016 Problems will be solved in class in week 5 PROBLEM 1 A rod of length L, cross-sectional area A1, and modulus of elasticity E1 has been placed inside a tube of the same length L, but of cross-sectional area A2 and modulus of elasticity E2. A force P is applied on a rigid plate attached to both tube and rod, as shown in the sketch below. Determine: a) the horizontal displacement of the rigid plate; b) the fixed support reactions acting on the rod and tube when E1=E2; c) the fixed support reactions acting on the rod and tube when E1=2E2; HINT: deformation of tube and rod is constrained to be the same. PROBLEM 2 A steel beam has a rectangular cross section of height lx=20 mm and width ly=30 mm, and length lz=1 m (lengths lx, ly and lz are measured respectively along x, y and z axes of a Cartesian system). The material of the beam has Young modulus E=200 GPa, Poisson ratio ν=0.29, and maximum allowable normal stress of 175 MPa. The beam is subject to a compressive centric axial load Pz of 80 KN applied at its ends (load acts along z axis). a) State whether the area of the cross section of the beam will increase or decrease under the effect of the applied centric axial load and explain why. b) Determine the variation of the section height lx in mm, indicating if such variation is a contraction or an elongation. c) Determine the maximum axial load (Pz)max applicable to the beam and the maximum shear stress in these conditions. d) In the loading condition (c), state whether the uniformly distributed normal load to be applied on the beam faces normal to the x axis leading to a zero variation of the section height lx is compressive or tensile and justify your answer. e) In the loading condition (c), determine the magnitude of the uniformly distributed normal load to be applied on the beam faces normal to the x axis resulting in zero variation of the section height lx. f) After application of the uniformly distributed normal load, determine the bulk modulus and the beam dilatation indicating its sign. PROBLEM 3 A beam has a constant circular cross section of radius 20 mm, and is subject to a tensile axial load of 4 KN. a) Determine the magnitude of the maximum stress in the cross section when the axial load is applied at the centre of the section. b) In the loading condition (a), state whether a neutral axis exists or not, and explain why. c) State whether the maximum stress in the cross section when the axial load is applied at 10 mm from the centre of the section is compressive or tensile and explain why. d) In the loading condition (c), determine the magnitude of the maximum compressive and tensile stresses in the cross section. e) In the loading condition (c), determine the distance of the neutral axis from the centre of the cross section. PROBLEM 4 Consider a simply supported beam subject to the distributed load sketched below. a) Determine the equations of shear force V(x) and bending-moment M(x); b) plot V(x) and M(x) along the beam axis; c) assuming the cross section is square and has length a , determine the position along the beam where the maximum normal stress occurs and the value of such maximum normal stress; d) determine the position along the beam where the maximum shear stress occurs and the value of such maximum shear stress.

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A light goes on in a room just before an excruciatingly loud buzzer sounds. A subject who startles when the light goes on shows ________ behavior, but one who leaves the room to avoid the noise exhibits ________ behavior. Correct Answer respondent; operant Incorrect Response operant; respondent conditioned; counterconditioned counterconditioned; conditioned

A light goes on in a room just before an excruciatingly loud buzzer sounds. A subject who startles when the light goes on shows ________ behavior, but one who leaves the room to avoid the noise exhibits ________ behavior. Correct Answer respondent; operant Incorrect Response operant; respondent conditioned; counterconditioned counterconditioned; conditioned

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