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)

1. Develop a thought experiment that attempts to uncover hidden assumptions about human freedom. 2. Find a paragraph from a book, magazine, ect. First, tell whether there are claims in the paragraph. If there are, identify the types of claims (descriptive, normative, a priori, a posteriori) in the paragraph

## 1. Develop a thought experiment that attempts to uncover hidden assumptions about human freedom. 2. Find a paragraph from a book, magazine, ect. First, tell whether there are claims in the paragraph. If there are, identify the types of claims (descriptive, normative, a priori, a posteriori) in the paragraph

Let us think of a thought experiment that wants to … Read More...

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1. A biological psychologist would be most interested in conducting research on the relationship between A) neurotransmitters and depression. B) bone density and body size. C) self-esteem and popularity. D) genetics and eye color. 2. The function of dendrites is to A) receive incoming signals from other neurons. B) release neurotransmitters into the spatial junctions between neurons. C) coordinate the activation of the parasympathetic and sympathetic nervous systems. D) control pain through the release of opiate-like chemicals into the brain. 3. Sensory neurons are located in the A) thalamus. B) reticular formation. C) peripheral nervous system. D) sensory cortex. 4. The part of the brainstem that controls heartbeat and breathing is called the A) cerebellum. B) medulla. C) amygdala. D) thalamus. 5. After flying from California to New York, Arthur experienced a restless, sleepless night. His problem was most likely caused by a disruption of his normal A) change blindness. B) circadian rhythm. C) hypnagogic sensations. D) sleep paralysis. 6. Mr. Oates always sleeps restlessly, snorting and gasping throughout the night. It is most likely that Mr. Oates suffers from A) sleep apnea. B) narcolepsy. C) night terrors. D) insomnia. 7. A condition in which a person can respond to a visual stimulus without consciously experiencing it is known as A) narcolepsy. B) change blindness. C) REM rebound. D) blindsight. 8. Consciousness is to unconsciousness as ________ is to ________. A) tolerance; withdrawal B) sequential processing; parallel processing C) latent content; manifest content D) delta wave; alpha wave 9. Auditory stimulation is first processed in the ________ lobes. A) occipital B) temporal C) frontal D) parietal 10. Acetylcholine is a neurotransmitter that A) causes sleepiness. B) lessens physical pain. C) reduces depressed moods. D) triggers muscle contractions. 11. Which of the following is not one of the phases of the general adaptation syndrome: A) attention B) alarm reaction C) resistance D) exhaustion 12. People with Type B personality A) Are at a greater risk for heart disease B) Tend to be more easy-going than those with Type A personality C) Are at a greater risk for depression D) Tend to be more motivated to do well than those with Type A personality 13. Which is an example of problem-focused coping A) Studying harder for an exam after you got a bad grade on the first one B) Trying not to think about how angry you are C) Distracting yourself by watching a funny movie D) Talking about how upset you are with your friend 14. People with an external locus of think that A) events are largely outside of their control B) too much personal freedom decreases life satisfaction. C) individuals can influence their own outcomes in life. D) self-control gets permanently weaker with age 15. Which of the following is a benefit of social support A) improved immune system functioning B) decreased blood pressure C) improved health D) all of the above

## 1. A biological psychologist would be most interested in conducting research on the relationship between A) neurotransmitters and depression. B) bone density and body size. C) self-esteem and popularity. D) genetics and eye color. 2. The function of dendrites is to A) receive incoming signals from other neurons. B) release neurotransmitters into the spatial junctions between neurons. C) coordinate the activation of the parasympathetic and sympathetic nervous systems. D) control pain through the release of opiate-like chemicals into the brain. 3. Sensory neurons are located in the A) thalamus. B) reticular formation. C) peripheral nervous system. D) sensory cortex. 4. The part of the brainstem that controls heartbeat and breathing is called the A) cerebellum. B) medulla. C) amygdala. D) thalamus. 5. After flying from California to New York, Arthur experienced a restless, sleepless night. His problem was most likely caused by a disruption of his normal A) change blindness. B) circadian rhythm. C) hypnagogic sensations. D) sleep paralysis. 6. Mr. Oates always sleeps restlessly, snorting and gasping throughout the night. It is most likely that Mr. Oates suffers from A) sleep apnea. B) narcolepsy. C) night terrors. D) insomnia. 7. A condition in which a person can respond to a visual stimulus without consciously experiencing it is known as A) narcolepsy. B) change blindness. C) REM rebound. D) blindsight. 8. Consciousness is to unconsciousness as ________ is to ________. A) tolerance; withdrawal B) sequential processing; parallel processing C) latent content; manifest content D) delta wave; alpha wave 9. Auditory stimulation is first processed in the ________ lobes. A) occipital B) temporal C) frontal D) parietal 10. Acetylcholine is a neurotransmitter that A) causes sleepiness. B) lessens physical pain. C) reduces depressed moods. D) triggers muscle contractions. 11. Which of the following is not one of the phases of the general adaptation syndrome: A) attention B) alarm reaction C) resistance D) exhaustion 12. People with Type B personality A) Are at a greater risk for heart disease B) Tend to be more easy-going than those with Type A personality C) Are at a greater risk for depression D) Tend to be more motivated to do well than those with Type A personality 13. Which is an example of problem-focused coping A) Studying harder for an exam after you got a bad grade on the first one B) Trying not to think about how angry you are C) Distracting yourself by watching a funny movie D) Talking about how upset you are with your friend 14. People with an external locus of think that A) events are largely outside of their control B) too much personal freedom decreases life satisfaction. C) individuals can influence their own outcomes in life. D) self-control gets permanently weaker with age 15. Which of the following is a benefit of social support A) improved immune system functioning B) decreased blood pressure C) improved health D) all of the above

The correct answer has an “*” in front of it. … Read More...
10. Which of the following statements is CORRECT? a. The proper goal of the financial manager should be to maximize the firm’s expected cash flows, because this will add the most wealth to each of the individual shareholders (owners) of the firm. b. The financial manager should seek that combination of assets, liabilities, and capital that will generate the largest expected after-tax income over the relevant time horizon. c. The riskiness inherent in a firm’s earnings per share (EPS) depends on the characteristics of the projects the firm selects, which means it depends upon the firm’s assets, but EPS does not depend on the manner in which those assets are financed. d. Large, publicly-owned firms like AT&T and GM, are controlled by their management teams. Ownership is generally widely dispersed, hence managers have great freedom in how they manage the firm. Managers may operate in stockholders’ best interests, but they may also operate in their own personal best interests. As long as managers stay within the law, there are no effective tools that can be used to motivate them to take actions that are in the stockholders’ best interests. e. Potential conflicts of interest can exist between stockholders and managers, and also between stockholders and bondholders.

## 10. Which of the following statements is CORRECT? a. The proper goal of the financial manager should be to maximize the firm’s expected cash flows, because this will add the most wealth to each of the individual shareholders (owners) of the firm. b. The financial manager should seek that combination of assets, liabilities, and capital that will generate the largest expected after-tax income over the relevant time horizon. c. The riskiness inherent in a firm’s earnings per share (EPS) depends on the characteristics of the projects the firm selects, which means it depends upon the firm’s assets, but EPS does not depend on the manner in which those assets are financed. d. Large, publicly-owned firms like AT&T and GM, are controlled by their management teams. Ownership is generally widely dispersed, hence managers have great freedom in how they manage the firm. Managers may operate in stockholders’ best interests, but they may also operate in their own personal best interests. As long as managers stay within the law, there are no effective tools that can be used to motivate them to take actions that are in the stockholders’ best interests. e. Potential conflicts of interest can exist between stockholders and managers, and also between stockholders and bondholders.

Answer: e 10.    Which of the following statements is CORRECT?  … Read More...

Non-violence as a rule of love   The mainly essential … Read More...