PHYS 1315 ONLINE Exam 2 REVIEW SAMPLE Fall2022

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PHYS 1315 ONLINE - Exam 2 REVIEW SAMPLE Test Coverage: Chapters 3 (partly), 4, 5, 6, and (partly) 7 Test Instructions Exam 1 Schedule: OPENS 7 am Wednesday, October 12, 2022 and CLOSES 11:59 pm Thursday, October 13, 2022 (Time to test: 90 minutes maximum) Exam 2 Additional Instructions: >Use Lockdown Browser and Webcam (with microphone). Please make sure that you have a laptop computer or iPad with Lockdown Browser and Webcam installed and operational. >Use TI30X or TI83 or TI84 graphing calculator, 1-2 pcs white scratch paper, and dark lead pencil for scribbling/showing work . NOTE: This REVIEW Material is NOT allowed while testing. >Use 1-2 pcs index card 4”x6” as formula sheet. Both sides allowed. Prepare your formula sheet at least a day prior to the exam . >No water or restroom breaks while testing. No other electronic devices allowed while taking the test. >Strong Suggestion -- Read the entire exam. Do the problems you know you can do first. Next do the problems you think you can do. Anything else is last. >Show complete work for the problems and then apply the rules of sig. fig. in your final answers. > For Free-Response Questions (FRQs) or Open-Ended Problems, do NOT write units in your final answers. Write answers in regular notation, NOT in scientific notation. I. Sample Multiple Choice. Choose the best answer. (2 pts each ) ___ 1. A barbell requires 30.0 N of force to raise a certain height. The power expended for a barbell raised 2.00 m in 2.00 min (convert minutes to seconds) is A. 30.0 W. B. 1.00 W. C. 0.500 W. D. 120 W. ___ 2. What is the name of the force affecting the motion of a projectile, if air resistance is negligible? A. Force of gravity. B. Applied force. C. Buoyant force. D. Net force. ___ 3. In uniform circular motion, the speed of the rotating object A. remains the same. B. increases. C. decreases. D. Not enough information. 1

___ 4. What is the shape of the path of a projectile? A. Trajectory. B. Projectile. C. Parabola. D. Neither. ___ 5. What is the name of the imaginary path of a projectile? A. Trajectory. B. Projectile. C. Parabola. D. Neither. ___ 6. According to Archimedes Principle, the buoyant force is equal to the A. weight of the object floating on liquid. B. volume of the liquid displaced by the immersed object. C. weight of the water displaced by the object immersed in the liquid. D. mass of the water displaced by the object immersed in the liquid. ___7. Which of the following is/are the benefit(s) derived from simple machines? A. Simple machines multiply the applied force. B. Simple machines change the direction of the input force. C. Simple machines distribute the force over a longer distance. D. All of the above. ___ 8. A moving object has A. velocity. B. momentum. C. energy. D. all of the above ___ 9. Work is done when A. the displacement is NOT zero. B. the displacement is zero. C. the force is zero. D. the force and displacement are perpendicular. ___ 10. Which law of conservation states that energy can transform? That energy cannot be created nor destroyed. A. Law of Conservation of Momentum. B. Law of Conservation of Energy. C. Law of Conservation of Charge. D. Newton’s Laws of Motion. ___ 11. An object that has kinetic energy must be A. at an elevated or higher position. B. moving. C. at rest. D. at a lower position. 2

___ 12. Which Newton’s law of motion is related to the Impulse-Momentum Theorem? A. Newton’s 1 st law of motion B. Newton’s 2 nd law of motion C. Newton’s 3 rd law of motion D. Newton’s universal law of gravitation ___ 13. When the speed of an object is doubled, its momentum A. remains unchanged in accord with the conservation of momentum. B. doubles. C. quadruples. D. decreases. ___ 14. When the force that produces an impulse acts for twice as much time, the impulse is A. not changed. B. increased by two times. C. increased by four times. D. decreased by half. ___ 15. A fast-moving car hitting a haystack or hitting a cement wall produces vastly different results. Both experience A. the same change in momentum. B. the same impulse. C. the same force. D. A and B. ___ 16. If the masses of two planets are each somehow doubled, the force of gravity between them A. doubles. B. quadruples. C. reduces by half. D. reduces by one quarter. ___ 17. When an elevator accelerates upward, your weight reading on a scale is A. greater. B. less. C. zero. D. the normal weight. ___ 18. The velocity of a typical projectile can be represented by horizontal and vertical components. Assuming negligible air resistance, the horizontal component along the path of the projectile A. increases. B. decreases. C. remains the same. D. Not enough information. ___ 19. The speed of a satellite in an elliptical orbit A. varies. B. remains constant. C. acts at right angles to its motion. D. All of the above. 3

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___ 20. When a sample of 4 o C water is cooled, it A. expands. B. contracts. C. remains unchanged. D. not enough information. II. Sample Problem WITH Multiple Choice (MC). Answer the following problems. ROUND FINAL ANSWERS to TWO (2) or THREE (3) significant figures as indicated in each problem. DO NOT WRITE UNITS in your final answers . Units (of measure) are indicated in each question/problem to guide you with your work/solution. Do NOT write final answers in scientific notation. Write final answers in regular notation . ( Use g = 10 m/s 2 .) P1. ( 3 pts. ) Universal Law of Gravitation. What is the force of gravity between m 1 = 3590 kg and m 2 = 1685 kg with a separation distance of 0.250 m? G = 6.67 x 10 -11 N m 2 /kg 2 . Round final answer to 3 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 6.46 x 10 -2 N (B) 6.46 x 10 o N (C) 6.46 x 10 -1 N (D) 6.46 x 10 -3 N 4

P2. ( 3 pts. ) Pressure in a Liquid. A pool has a depth of 3.5 m. What is the pressure at the bottom of the pool? (Use D water = 1.0x10 3 kg/m 3 . Use g = 10 m/s 2 .) Round final answer to 2 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 3.4 x 10 4 Pa (B) 3.5 x 10 4 Pa (C) 3.4 x 10 3 Pa (D) 2.9 x 10 2 Pa P3. ( 3 pts. ) Momentum. A 3.3 kg toy car has a momentum of 13 kg·m/s going left. What is the velocity ( speed and direction ) of the toy? Round final answer to 2 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 43 m/s, left (B) 13 m/s, left (C) 3.9 m/s, left (D) 0.25 m/s, left 5

P4. ( 3 pts. ) Work. A 12.7 Joule of work is needed to push an object a distance of 4.50 m. Disregard the effect of friction. What is the amount of force applied on the object? Round final answer to 3 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 2.82 N (B) 57.2 N (C) 0.354 N (D) 8.20 N P5. ( 3 pts. ) Gravitational Potential Energy. A 11 kg pendulum bob is released from 0.80 m initial height relative to the equilibrium position. What is the gravitational potential energy of the bob? (Use g = 10 m/s 2 ). Round final answer to 2 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. 6

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MC: (A) 8.8 J (B) 11 J (C) 880 J (D) 88 J P6. ( 3 pts. ) Kinetic Energy. A 2.3 kg toy train has a constant velocity of 3.4 m/s going south. What is the kinetic energy of the toy train? Round final answer to 2 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 7.8 J (B) 13 J (C) 27 J (D) 53 J P7. ( 3 pts. ) Density. Find the mass of aluminum (density D = 2.7 g/cm 3 ) with a volume of 22 cm 3 . Round final answer to 2 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 0.12 grams (B) 8.1 grams (C) 22 grams (D) 59 grams 7

P8. ( 3 pts. ) Archimedes’ Principle. The object immersed in water displaced 5.5 grams of water. What is the buoyant force (in Newtons) experienced by the object? ( Use g = 10 m/s 2 .) Round final answer to 2 sig fig. Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. MC: (A) 4.9 N (B) 5.5 N (C) 0.055 N (D) 0.55 N Study also Conversion of Temperatures and have the four (4) formulas written on your index card . P9. ( 3 pts. ) Temperature Conversion. Convert 98.8 o F to o C. Round final answer to 3 sig fig Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. 8

MC: (A) 37 o C (B) 37.1 o C (C) 209 o C (D) 174 o C P10. ( 3 pts. ) Quantity of Heat, Q. A 2.03 kg water has an initial temperature of 5.00 o C and a final temperature of 77.0 o C with a specific heat capacity of 4190 J/kg o C. Find the amount of heat absorbed by the water. Round final answer to 3 sig fig Equation(s)/Solution/Work: Answer: Answer here must be rounded to correct sig. fig. Formula: Q = mc  T where: Q = quantity of heat absorbed (or released) in J m = mass in kg c = specific heat capacity in J/kg o C  T = change in temperature in o C or C o = final temperature – initial temperature = T f - T i MC: (A) 6.09 x 10 5 J (B) 6.12 x 10 5 J ( C) 6.09 x 10 4 J ( D) 6.12 x 10 4 J III. Sample Short Essay. Answer completely in your own words in 3 to 5 sentences. 1. For the same force, why does a longer cannon impart (or produce) more speed to a cannonball? Elaborate your answer. 9

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2. At what part of its trajectory does the baseball (as a projectile) have minimum speed? Elaborate your answer. 3. What are the factors affecting the force of gravity (in Newton's law of universal gravitation)? Elaborate your answer by explaining the factors that are directly and inversely proportional to the force of gravity. 4. A boulder (huge rock) is thrown into a deep lake. As it sinks deeper and deeper into the water, does the buoyant force on it increase, decrease, or remain the same? Elaborate your answer. 5. Explain entropy and discuss which of the three laws of thermodynamics has direct connection with entropy. Elaborate your answer. 6. Which thermodynamics law relates to the law of conservation of energy? Elaborate your answer. 10

KEY- PHYS 1315 – Exam 2 REVIEW SAMPLE I. Sample Multiple Choice 1. C 2. A 3. A 4. C 5. A 6. C 7. D 8. D 9. A 10. B 11. B 12. B 13. B 14. B 15. D 16. B 17. A 18. C 19. A 20. A II. Sample Problem P1. F g = 6.46 x 10 -3 N P6. KE = 13 J D B P2. P liquid = 3.5 x 10 4 Pa P7. m = 59 g B D P3. v = 3.9 m/s going left P8. F B = 0.055 N C C P4. F = 2.82 N P9. T C = 37.1 o C A B 11

P5. PEg = 88 J P10. Q = 6.12 x 10 5 J D B 12

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PHYS 1315 ONLINE Exam 2 REVIEW SAMPLE Fall2022

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