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1. A force of 1 newton is equivalent to 1 A) kg × m s2 B) kg × m A) B) C) D) 2 2 C) kg × m s2 2 D) kg 2 × m s2 2. Which two quantities can be expressed using the same units? A) B) C) D) energy and force impulse and force momentum and energy impulse and momentum 3. The fundamental unit of mass in the mks system is the A) milligram C) kilogram B) gram D) decigram 4. The mass of a paper clip is approximately A) l × l06 kg C) 1 ×10 –3 kg B) l × l03 kg D) 1 ×10 –6 kg 5. The approximate height of a 12-ounce can of root beer is A) 1.3 × 10 –3 m C) 1.3 × 10 0 m B) 1.3 × 10 –1 m D) 1.3 × 10 1 m 6. The weight of an apple is closest to A) 10 –2 N C) 10 2 N B) 10 0 N D) 10 4 N 7. In a 4.0-kilometer race, a runner completes the first kilometer in 5.9 minutes, the second kilometer in 6.2 minutes, the third kilometer in 6.3 minutes, and the final kilometer in 6.0 minutes. The average speed of the runner for the race is approximately A) 0.16 km/min C) 12 km/min B) 0.33 km/min D) 24 km/min 8. A force of 10 Newtons is required to move an object at a constant speed of 5 meters per second. The power used is A) 0.5 W B) 2 W 9. Oil drips at 0.4-second intervals from a car that has an oil leak. Which pattern best represents the spacing of oil drops as the car accelerates uniformly from rest? C) 5 W D) 50 W 10. Which graph best represents the relationship between the acceleration of an object falling freely near the surface of Earth and the time that it falls? A) B) C) D) Base your answers to questions 11 through 14 on the graph below, which shows the velocity of a 1,500-kilogram car during a 20-second-time interval.. 11. No unbalanced force is acting on the car during time interval A) BC B) CD C) EF D) FG 12. The acceleration of the car during time interval AB is A) 0.40 m./sec. 2 C) 10 m./sec. 2 B) 2.5 m./sec. 2 D) 40 m./sec. 2 13. During time interval CD, the average velocity of the car is A) 7.5 m./sec. C) 15 m./sec. B) 17.5 m./sec. D) 35 m./sec. 14. The impulse applied to the car during time interval AB is A) C) N-sec. N-sec. B) D) N-sec. N-sec. Base your answers to questions 15 through 20 on the graph below which represents the relationship between speed and time for an object in motion along a straight line. 15. What is the acceleration of the object during the time interval t = 3 seconds to t = 5 seconds? A) 5.0 m/sec 2 B) 7.5 m/sec 2 C) 12.5 m/sec 2 D) 17.5 m/sec 2 16. What is the average speed of the object during the time interval t = 6 seconds to t = 8 seconds'? A) 7.5 m/sec B) 10 m/sec C) 15 m/sec D) 17.5 m/sec 17. What is the total distance traveled by the object during the first 3 seconds? A) 15 m B) 20 m C) 25 m D) 30 m 18. During which interval is the object's acceleration the greatest? A) AB B) CD C) DE D) EF 19. During the interval t = 8 seconds to t = 10 seconds, the speed of the object is A) zero C) decreasing B) increasing D) constant, but not zero 20. What is the maximum speed reached by the object during the 10 seconds of travel? A) 10 m/sec B) 25 m/sec C) 150 m/sec D) 250 m/sec Base your answers to questions 21 through 25 on the diagram below which represents carts A and B being pushed apart by a spring which exerts an average force of 50. Newtons for a period of 0.20 second. [Assume friction-less conditions.] 26. If the force vector shown in the diagram above is resolved into two components, these two components could best be represented by which diagram below? 21. What is the magnitude of the impulse applied by the spring on cart A? A) 5.0 N-sec C) 50. N-sec B) twice as great D) four times as great 23. Compared to the velocity of cart B at the end of the 0.20-second interaction, the velocity of cart A is A) one-half as great C) the same B) C) D) B) 10. N-sec D) 100 N-sec 22. Compared to the magnitude of the impulse acting on cart A, the magnitude of the impulse acting on cart B is A) one-half as great C) the same A) 27. Which is a scalar quantity? A) acceleration C) speed B) momentum D) displacement 28. The diagram below represents a constant force F acting on a box located on a frictionless horizontal surface. B) twice as great D) four times as great 24. What is the average acceleration of cart B during the 0.20-second interaction? A) 0 m/s 2 C) 25 m/s 2 B) 10. m/s 2 D) 50. m/s 2 25. Compared to the total momentum of the carts before the spring is released, the total momentum of the carts after the spring is released is A) one-half as great C) the same B) twice as great D) four times as great As the angle between the force and the horizontal increases, the acceleration of the box will A) decrease C) remain the same B) increase 29. The handle of a lawn roller is held at 45° from the 31. The diagram below shows a block on a horizontal horizontal. A force, F, of 28.0 Newtons is applied to the frictionless surface. A 100.- newton force acts on the handle as the roller is pushed across a level lawn, as block at an angle of 30.° above the horizontal. shown in the diagram below. What is the magnitude of force F if it establishes equilibrium? What is the magnitude of the force moving the roller forward? A) 7.00 N C) 19.8 N B) 14.0 N D) 39.0 N 30. The vector below represents the resultant of two forces acting concurrently on an object at point P. Which pair of vectors best represents two concurrent forces that combine to produce this resultant force vector? A) 50.0 N C) 100. N B) 86.6 N D) 187 N 32. What is the magnitude of the force needed to keep a 60.-newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2.0 meters per second? A) 40. N B) 51 N C) 60. N D) 120 N 33. In the diagram below, surface B of the wooden block has the same texture as surface A, but twice the area of surface A A) B) If force F is required to slide the block at constant speed across the table on surface A, approximately what force is required to slide the block at constant speed across the table on surface B? C) A) F D) B) 2F C) F D) 4F 34. An object falls freely near Earth’s surface. Which graph best represents the relationship between the object’s kinetic energy and its time of fall A) B) C) D) 35. A car travels at constant speed v up a hill from point A to point B, as shown in the diagram below. 39. A box is pushed to the right with a varying horizontal force. The graph below represents the relationship between the applied force and the distance the box moves. As the car travels from A to B, its gravitational potential energy A) increases and its kinetic energy decreases B) increases and its kinetic energy remains the same C) remains the same and its kinetic energy decreases D) remains the same and its kinetic energy remains the same 36. The diagram above represents a spring hanging vertically that stretches 0.075 meter when a 5.0- newton block is attached. The spring-block system is at rest in the position shown. The value of the spring constant is A) 38 N/m C) 130 N/m B) 67 N/m D) 650 N/m 37. A 0.50-kilogram object moves in a horizontal circular path with a radius of 0.25 meter at a constant speed of 4.0 meters per second. What is the magnitude of the object’s acceleration? A) 8.0 m/s 2 C) 32 m/s 2 B) 16 m/s 2 D) 64 m/s 2 38. A spring has a spring constant of 120 newtons per meter. How much potential energy is stored in the spring as it is stretched 0.20 meter? A) 2.4 J B) 4.8 J C) 12 J D) 24 J What is the total work done in moving the box 6.0 meters? A) 9.0 J B) 18 J C) 27 J D) 36 J Base your answers to questions 40 through 44 on the diagram below which represents a simple pendulum with a 2.0-kilogram bob and a length of 10. meters. The pendulum is released from rest at position 1 and swings without friction through position 4. At position 3, its lowest point, the speed of the bob is 6.0 meters per second. 46. In raising an object vertically at a constant speed of 2.0 meters per second, 10. watts of power is developed. The weight of the object is A) 5.0 N B) 20. N C) 40. N D) 50. N 47. In the diagram below, 400. joules of work is done raising a 72-newton weight a vertical distance of 5.0 meters. 40. At which position does the bob have its maximum kinetic energy? A) 1 B) 2 C) 3 D) 4 41. What is the potential energy of the bob at position 1 in relation to position 3? A) 18 J B) 36 J C) 72 J D) 180 J 42. At position 4, the centripetal force on the bob is directed toward point A) A B) B C) C D) D 43. What is the centripetal acceleration of the bob at position 3? A) 1.8 m/s 2 C) 7.2 m/s 2 B) 3.6 m/s 2 D) 36 m/s 2 44. Compared to the sum of the kinetic and potential energies of the bob at position 1, the sum of the kinetic and potential energies of the bob at position 3 A) less C) the same B) greater 45. A person does 100 joules of work in pulling back the string of a bow. What will be the initial speed of a 0.5-kilogram arrow when it is fired from the bow? A) 20 m/s C) 200 m/s B) 50 m/s D) 400 m/s How much work is done to overcome friction as the weight is raised? A) 40. J B) 360 J C) 400. J D) 760 J 48. If the critical angle for a substance is 44º, the index of refraction of the substance is equal to A) 1.0 B) 0.69 C) 1.4 D) 0.023 49. Base your answer to the following question on The diagram below shows a student throwing a baseball horizontally at 25 meters per second from a cliff 45 meters above the level ground. Approximately how far from the base of the cliff does the ball hit the ground? [Neglect air resistance.] A) 45 m B) 75 m C) 140 m D) 230 m Base your answers to questions 50 and 51 on the information and diagram below. The diagram shows a student seated on a rotating circular platform, holding a 2.0-kilogram block with a spring scale. The block is 1.2 meters from the center of the platform. The block has a constant speed of 8.0 meters per second. [Frictional forces on the block are negligible.] 50. Which statement best describes the block’s movement as the platform rotates? A) Its velocity is directed tangent to the circular path, with an inward acceleration. B) Its velocity is directed tangent to the circular path, with an outward acceleration. C) Its velocity is directed perpendicular to the circular path, with an inward acceleration. D) Its velocity is directed perpendicular to the circular path, with an outward acceleration. 51. The reading on the spring scale is approximately A) 20. N B) 53 N C) 110 N D) 130 N Base your answers to questions 52 and 53 on the information and diagram below A golf ball leaves a golf club with an initial velocity of 40.0 meters per second at an angle of 40º with the horizontal. 52. What is the vertical component of the golf ball’s initial velocity? A) 25.7 m/s C) 40.0 m/s B) 30.6 m/s D) 61.3 m/s 53. What is the total horizontal distance traveled by the golf ball during the first 2.50 seconds of its flight? A) 100. m C) 64.3 m B) 76.6 m D) 40.0 m Answer Key take home april 1. A 37. D 2. D 38. A 3. C 39. C 4. C 40. C 5. B 41. B 6. B 42. A 7. A 43. B 8. D 44. C 9. B 45. A 10. D 46. A 11. A 47. A 12. B 48. C 13. B 49. B 14. D 50. A 15. B 51. C 16. D 52. A 17. C 53. B 18. A 19. C 20. B 21. B 22. C 23. B 24. C 25. C 26. D 27. C 28. A 29. C 30. D 31. B 32. A 33. A 34. D 35. B 36. B