Active Physics Review Guide 4 2 4 4 Answers

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					            Active Physics Review Guide CH4.2-4.4                   Answer Section
TRUE/FALSE                                                                 28. C
     1. T                                                                  29. A
     2. T                                                                  30. B
     3. F                                                                  31. A
     4. T                                                                  32. B
     5. T                                                                  33. C
     6. T                                                                  34. D
     7. F                                                                  35. B
     8. F                                                             SHORT ANSWER
     9. F                                                                  36. 3.0 J
MULTIPLE CHOICE                                                            37. 8.0  10 J
    10. B                                                                  38. 0 m/s.
    11. C                                                                  39. 40. m.
    12. D                                                                  40. 19.6 J.
    13. D                                                                  41. 2.4 J
    14. C                                                                  42. point B
    15. D                                                                  43. 400 N/m
    16. A                                                                  44. 200 J
    17. D                                                                  45. 1,920 J
    18. D                                                                  46. 0.5 J
    19. C                                                                  47. 1.0 J
    20. A                                                                  48. 3.3 J
    21. C                                                                  49. 7.5 J
    22. D                                                                  50. 4,000,000 J
    23. D                                                                  51. 2.4 J
    24. C                                                                  52. 1.4 kg
    25. B                                                                  53. 491 J
    26. A                                                                  54. 125 N
    27. C
    55. see student responses
    56. The force of gravity between two objects increases as the mass of one or both of the objects increases and
        decreases as the distance between them increases by the square of the distance.
    57. It would increase by a factor of 4.
    58. It would decrease by a factor of 4.
    59. It would decrease by a factor of 16.
    60. Answers will vary; students might cite the apparent motion of the Sun against the constellations of the Zodiac,
        or refer to observations made from space exploration.
    61. Copernicus proposed an Earth-centered model of the Solar System.
    62. Galileo made observations through a telescope that supported Copernicus’ idea.
    63. Kepler determined that the planets move in elliptical orbits, not circular orbits.
    64. Newton’s Law of Universal Gravitation explained and predicted the motion of the planets in the Solar System
        and other objects in space.
    65. The three criteria for a good scientific theory are that it can make accurate predictions, that observations can
        be repeated by other observers, and that the theory can be used to explain more than one event.

				
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