MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put ALL calculations and answers in your Blue Book! 1. Materials are characterized by: a. Macroscopic properties b. Microstructure c. Atomic level composition d. All of the above 2. Atoms are: a. Discrete units of matter b. An abstract concept c. Found in fractional units d. Crystallographic lattice points 3. The Burger’s vector describes: a. Surface cracks b. Crystal twinning c. Dislocation geometry d. The most direct route to McDonald’s 4. Cubic Close Packed (CCP) is another name for which of the following: a. HCP b. BCC c. FCC d. All of the above 5. Glass and ceramic materials tend to: a. Fail catastrophically at low strain b. Show ductility c. Deform plastically before failure d. Have elastic moduli ~106 Pa 6. Solid state diffusion & vacancy generation: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Describe lattice point motion 7. Diffusion & heat transfer: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Have identical differential equations 8. A vacancy and a dislocation both: a. Disrupt the crystal lattice b. Represent partial occupancy c. Contain ruptured bonds d. Are low energy regions 9. Dislocations: a. Are interstitial dopants b. Are crystal defects c. Require atomic impurities d. Enhance plastic deformation 10. Ionic, covalent and metallic bonding are primary bonding types. a. Primary bonds require exchange or sharing of what between atoms? b. How does electronegativity drive the reaction of sodium metal and chlorine gas to form sodium chloride? c. Carbon-carbon bonds are what type? d. The directional nature of covalent bonds is related to what structural feature of atoms? 11. The (111) plane of the FCC structure is close-packed. a. Sketch this plane within a unit cell. b. How many atoms are on the plane you drew inside the unit cell? c. Estimate the area of the plane d. Calculate the area atomic density e. If there is one vacancy per 1012 lattice points at 273K, what is the partial atomic occupancy of each lattice point? f. If you are asked calculate the number of vacancies present at 600K, what additional information do you need? 12. Dislocation motion occurs largely along close-packed directions and planes. First, compare the FCC & BCC structures: a. Describe any close packed planes b. Describe any close packed directions c. If the ductile-to-brittle transition at low temperatures is related to the number of close-packed directions and planes, do you expect BCC or FCC metals to have greater ductility? d. Magnesium and other HCP metals are brittle. Does your analysis from 12.c. support this observation? 13. A tensile test is performed on a ductile sample. The first 1% of strain is elastic with a modulus of 100E9 Pa, at which point plastic deformation begins. The tensile strength of 1.1E9 Pa is determined at 9% strain, while failure occurs at a stress of 9E8 Pa and strain of 18%. a. Sketch the complete stress-strain cycle b. Estimate the toughness in units of J/m3.

MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put ALL calculations and answers in your Blue Book! 1. Materials are characterized by: a. Macroscopic properties b. Microstructure c. Atomic level composition d. All of the above 2. Atoms are: a. Discrete units of matter b. An abstract concept c. Found in fractional units d. Crystallographic lattice points 3. The Burger’s vector describes: a. Surface cracks b. Crystal twinning c. Dislocation geometry d. The most direct route to McDonald’s 4. Cubic Close Packed (CCP) is another name for which of the following: a. HCP b. BCC c. FCC d. All of the above 5. Glass and ceramic materials tend to: a. Fail catastrophically at low strain b. Show ductility c. Deform plastically before failure d. Have elastic moduli ~106 Pa 6. Solid state diffusion & vacancy generation: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Describe lattice point motion 7. Diffusion & heat transfer: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Have identical differential equations 8. A vacancy and a dislocation both: a. Disrupt the crystal lattice b. Represent partial occupancy c. Contain ruptured bonds d. Are low energy regions 9. Dislocations: a. Are interstitial dopants b. Are crystal defects c. Require atomic impurities d. Enhance plastic deformation 10. Ionic, covalent and metallic bonding are primary bonding types. a. Primary bonds require exchange or sharing of what between atoms? b. How does electronegativity drive the reaction of sodium metal and chlorine gas to form sodium chloride? c. Carbon-carbon bonds are what type? d. The directional nature of covalent bonds is related to what structural feature of atoms? 11. The (111) plane of the FCC structure is close-packed. a. Sketch this plane within a unit cell. b. How many atoms are on the plane you drew inside the unit cell? c. Estimate the area of the plane d. Calculate the area atomic density e. If there is one vacancy per 1012 lattice points at 273K, what is the partial atomic occupancy of each lattice point? f. If you are asked calculate the number of vacancies present at 600K, what additional information do you need? 12. Dislocation motion occurs largely along close-packed directions and planes. First, compare the FCC & BCC structures: a. Describe any close packed planes b. Describe any close packed directions c. If the ductile-to-brittle transition at low temperatures is related to the number of close-packed directions and planes, do you expect BCC or FCC metals to have greater ductility? d. Magnesium and other HCP metals are brittle. Does your analysis from 12.c. support this observation? 13. A tensile test is performed on a ductile sample. The first 1% of strain is elastic with a modulus of 100E9 Pa, at which point plastic deformation begins. The tensile strength of 1.1E9 Pa is determined at 9% strain, while failure occurs at a stress of 9E8 Pa and strain of 18%. a. Sketch the complete stress-strain cycle b. Estimate the toughness in units of J/m3.

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Southwest Rafters Case 2:Case 1: Capital Budgeting Cash Flows and Capital Budgeting Techniques Create a data sheet (or section) and link calculations to the data so that if the data is updated the calculations automatically update. 1) Calculate the Initial Cash Outlay and Annual Capital Budgeting Cash Flow for years 1 thru 5 for both alternatives. 2) Discuss the ethical implications of this business. Might there be a difference between these two alternatives? 3) Calculate the Payback Period, Net Present Value and Internal Rate of Return for both alternatives based on your Initial Cash Outlay and Capital Budgeting Cash Flows. 4) Calculate NPV and IRR if cash flows increase at an estimated 6% annual rate. 5) What discount rate would leave them indifferent between the two alternatives? 6) What does the discount rate in #5 imply about the growth rate needed to make the Buenaventura better than the Green? 7) What is the probability of negative NPV both in the case of perfect serial correlation and in the case of independence of cash flows for both alternatives? Assume no growth and a $5,000 standard deviation of annual cash flow for both alternatives. 8) Calculate Accounting (Profit) and Cash Breakeven Points (average number of clients per trip) and the Degree of Operating Leverage for both alternatives for year 1. Treat all revenue as variable. Treat all expenses as fixed except the client portion of transportation and food and the administrative cost. Include externalities. If you spreadsheet is functional BEP is easy! 9) Could either alternative have Multiple Internal Rates of Return? Explain 10) Discuss the option values associated with these alternatives. Is there a difference between them? 11) Which alternative do you recommend for Southwest Rafters? Defend your choice using the results from the other questions. Assume that the assumptions are reasonable.

Southwest Rafters Case 2:Case 1: Capital Budgeting Cash Flows and Capital Budgeting Techniques Create a data sheet (or section) and link calculations to the data so that if the data is updated the calculations automatically update. 1) Calculate the Initial Cash Outlay and Annual Capital Budgeting Cash Flow for years 1 thru 5 for both alternatives. 2) Discuss the ethical implications of this business. Might there be a difference between these two alternatives? 3) Calculate the Payback Period, Net Present Value and Internal Rate of Return for both alternatives based on your Initial Cash Outlay and Capital Budgeting Cash Flows. 4) Calculate NPV and IRR if cash flows increase at an estimated 6% annual rate. 5) What discount rate would leave them indifferent between the two alternatives? 6) What does the discount rate in #5 imply about the growth rate needed to make the Buenaventura better than the Green? 7) What is the probability of negative NPV both in the case of perfect serial correlation and in the case of independence of cash flows for both alternatives? Assume no growth and a $5,000 standard deviation of annual cash flow for both alternatives. 8) Calculate Accounting (Profit) and Cash Breakeven Points (average number of clients per trip) and the Degree of Operating Leverage for both alternatives for year 1. Treat all revenue as variable. Treat all expenses as fixed except the client portion of transportation and food and the administrative cost. Include externalities. If you spreadsheet is functional BEP is easy! 9) Could either alternative have Multiple Internal Rates of Return? Explain 10) Discuss the option values associated with these alternatives. Is there a difference between them? 11) Which alternative do you recommend for Southwest Rafters? Defend your choice using the results from the other questions. Assume that the assumptions are reasonable.

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A laser pulse of energy 2.00 mJ has a pulse length of 3.00 ns. If this laser pulse is focused to a spot size of radius r =1.25 mm, find the peak electric field amplitude associated with this pulse. Assume that the pulse is uniform in time and uniform in intensity across the area of the spot.

A laser pulse of energy 2.00 mJ has a pulse length of 3.00 ns. If this laser pulse is focused to a spot size of radius r =1.25 mm, find the peak electric field amplitude associated with this pulse. Assume that the pulse is uniform in time and uniform in intensity across the area of the spot.

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b. Two surfaces A and B are close to each other and are exchanging heat with each other. Surface A is coated with white paint and is maintained at temperature 200oC. It is located directly opposite to surface B which is considered a black body and is maintained at 800oC. Calculate the amount of heat energy that needs to be removed from surface A per unit area to maintain its constant temperature

b. Two surfaces A and B are close to each other and are exchanging heat with each other. Surface A is coated with white paint and is maintained at temperature 200oC. It is located directly opposite to surface B which is considered a black body and is maintained at 800oC. Calculate the amount of heat energy that needs to be removed from surface A per unit area to maintain its constant temperature

Nancy’s plans for a square garden include an area of (x2 + 12x + 36) m2. Write expressions for the length and width of this square garden. 2. The plans for the square garden shows a length of 12 m. What is the width of the square garden? Using the area from problem 1, what is the value of x? What is the total area of this square garden?

Nancy’s plans for a square garden include an area of (x2 + 12x + 36) m2. Write expressions for the length and width of this square garden. 2. The plans for the square garden shows a length of 12 m. What is the width of the square garden? Using the area from problem 1, what is the value of x? What is the total area of this square garden?

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A circular loop of wire, 8.0 cm in diameter and having 600 turns is placed outside and close to one end of a relatively large solenoid with variable current. The solenoid is sufficiently large such that the magnetic field it generates is homogeneous over the area of the loop. Two ends of the loop are connected to a voltmeter that measures the voltage induced inside the loop. When the solenoid is powered up the magnetic field changes from zero to final steady value of 0.5 T. How quickly must the magnetic field be switched on so that the induced voltage in the lop does no exceed 12 V.

A circular loop of wire, 8.0 cm in diameter and having 600 turns is placed outside and close to one end of a relatively large solenoid with variable current. The solenoid is sufficiently large such that the magnetic field it generates is homogeneous over the area of the loop. Two ends of the loop are connected to a voltmeter that measures the voltage induced inside the loop. When the solenoid is powered up the magnetic field changes from zero to final steady value of 0.5 T. How quickly must the magnetic field be switched on so that the induced voltage in the lop does no exceed 12 V.

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Discuss the differences in North Pole and the magnetic North Pole, and the South Pole and the magnetic South Pole in terms of dip angle and magnetic declination. Discuss the cause of northern lights

Discuss the differences in North Pole and the magnetic North Pole, and the South Pole and the magnetic South Pole in terms of dip angle and magnetic declination. Discuss the cause of northern lights

The South Pole of the Earth’s magnet is in the … Read More...
NAME: _____________________________________________ (print) INTRODUCTORY SURVEYING – MINING ENGINEERING 2400 Second Midterm Exam October 24, 2014 Work all four problems in the space provided. Solutions must be neat and logically presented for full credit. 1. (25 pts) Put an “X” over the letter corresponding to correct answers for the following multiple choice questions. A theodolite is used to estimate a distance using stadia. The stadia factor is 100, the stadia constant is zero, the zenith angle is 90°, the upper reading is 10.20, the rod reading is 7.75 and the lower reading is 5.30. The best estimate for horizontal distance is: (a) 1020 ft; (b) 490 ft; (c) 245 ft; (d) if none of the preceding – provide your answer . From B the azimuth to A is 233° 15′ 30″. The angle right to C is 215° 05′ 15″. The azimuth of C to B is: (a)88°20’45”; (b) 268°20’45”; (c) 250°10’30”; (d) if none of the preceding – provide your answer. A five-level station is described as C3.5/34.1 C4.8/25.0 C6.7/0.0 C9.2/25.0 C10.8/33.6. How wide is the road? (a) 50.0 ft, (b) 67.7 ft, (c) 25.0 ft, (e) if none of the preceding – provide your answer . An engineer used a total station to complete a closed traverse at a construction site. The sum of LAT and sum of DEP were determined to be 0.04 and 0.07 respectively. The total horizontal distance measured 2510.00 ft. What is the corresponding precision? (a) 1/63000; (b) 1/36000; (c) 1/31000; (d) if none of the preceding-provide your answer. The interior angles of a closed six sided traverse measure: 34° 28′ 20″ 185° 37′ 00″ 110° 59′ 20″ 195° 10′ 40″ 81° 40′ 20″ 112° 05′ 20″ In adjusting this traverse, the adjusted value for the first angle is: (a) 34° 28′ 20″; (b) 34° 28′ 10″; ( c) 34° 28′ 30″; (d) if none of the preceding – provide your answer . 2. (15 pts) Given the position of points A and B, determine the azimuth of A to B to the nearest second. Point A 5470.00N 4710.00E Point B 5130.00N 5350.00E 3. (25 pts) The volume of a fill between station 24+00 and 26+00 on a 50-foot wide road is to be determined by the prismoidal method. The three level sections are given by: Stn. 24+00 F10.0 F12.0 F8.0 52.0 0.0 65.0 Stn. 25+00 F8.0 F10.0 F10.0 55.0 0.0 52.0 Stn. 26+00 F12.0 F8.0 F15.0 61.0 0.0 55.0 Determine the volume to the nearest 100 cubic feet. (All fill dimensions are in feet.) (Hint: The area at Stn. 25 is 760 sq ft and the area at Stn. 26 is 801.5 sq ft.) 4. (35 points) The following information was obtained from an angle-right traverse conducted on the surface with a total station (conventional practice for HI and HS, i.e. HS is above the target of interest and, therefore, indicated as negative in the notes): BS IS FS Angle Rt. Zenith Angle SD HI HS A B C 261°12’20” 97° 25’20” 355.33 4.99 -0.33 261°11’40” 262° 34’20” The position of B is N5000.00, E5000.00, El 5000.00. The azimuth of A to B is 49°18’30”. Determine the coordinates and elevation of C. Show and identify all intermediate calculations.

NAME: _____________________________________________ (print) INTRODUCTORY SURVEYING – MINING ENGINEERING 2400 Second Midterm Exam October 24, 2014 Work all four problems in the space provided. Solutions must be neat and logically presented for full credit. 1. (25 pts) Put an “X” over the letter corresponding to correct answers for the following multiple choice questions. A theodolite is used to estimate a distance using stadia. The stadia factor is 100, the stadia constant is zero, the zenith angle is 90°, the upper reading is 10.20, the rod reading is 7.75 and the lower reading is 5.30. The best estimate for horizontal distance is: (a) 1020 ft; (b) 490 ft; (c) 245 ft; (d) if none of the preceding – provide your answer . From B the azimuth to A is 233° 15′ 30″. The angle right to C is 215° 05′ 15″. The azimuth of C to B is: (a)88°20’45”; (b) 268°20’45”; (c) 250°10’30”; (d) if none of the preceding – provide your answer. A five-level station is described as C3.5/34.1 C4.8/25.0 C6.7/0.0 C9.2/25.0 C10.8/33.6. How wide is the road? (a) 50.0 ft, (b) 67.7 ft, (c) 25.0 ft, (e) if none of the preceding – provide your answer . An engineer used a total station to complete a closed traverse at a construction site. The sum of LAT and sum of DEP were determined to be 0.04 and 0.07 respectively. The total horizontal distance measured 2510.00 ft. What is the corresponding precision? (a) 1/63000; (b) 1/36000; (c) 1/31000; (d) if none of the preceding-provide your answer. The interior angles of a closed six sided traverse measure: 34° 28′ 20″ 185° 37′ 00″ 110° 59′ 20″ 195° 10′ 40″ 81° 40′ 20″ 112° 05′ 20″ In adjusting this traverse, the adjusted value for the first angle is: (a) 34° 28′ 20″; (b) 34° 28′ 10″; ( c) 34° 28′ 30″; (d) if none of the preceding – provide your answer . 2. (15 pts) Given the position of points A and B, determine the azimuth of A to B to the nearest second. Point A 5470.00N 4710.00E Point B 5130.00N 5350.00E 3. (25 pts) The volume of a fill between station 24+00 and 26+00 on a 50-foot wide road is to be determined by the prismoidal method. The three level sections are given by: Stn. 24+00 F10.0 F12.0 F8.0 52.0 0.0 65.0 Stn. 25+00 F8.0 F10.0 F10.0 55.0 0.0 52.0 Stn. 26+00 F12.0 F8.0 F15.0 61.0 0.0 55.0 Determine the volume to the nearest 100 cubic feet. (All fill dimensions are in feet.) (Hint: The area at Stn. 25 is 760 sq ft and the area at Stn. 26 is 801.5 sq ft.) 4. (35 points) The following information was obtained from an angle-right traverse conducted on the surface with a total station (conventional practice for HI and HS, i.e. HS is above the target of interest and, therefore, indicated as negative in the notes): BS IS FS Angle Rt. Zenith Angle SD HI HS A B C 261°12’20” 97° 25’20” 355.33 4.99 -0.33 261°11’40” 262° 34’20” The position of B is N5000.00, E5000.00, El 5000.00. The azimuth of A to B is 49°18’30”. Determine the coordinates and elevation of C. Show and identify all intermediate calculations.

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