ID: C C 9. The least difference between high and low tides occurs when the moon is a Di quarter moon. A. full moon. . None of these. B. half moon. A 10. If the mass of Earth doubled and the distance between the sun and Earth doubled, the force of gravity Tid between them would be times the original force. C. 1/4 A. 1/2 D. 2 B. 4 11. If Earth's mass decreased to one half its original mass, with no change in radius, then your weight would A. stay the same. C. decrease to 1/4 your original weight. B. decrease to 1/2 your original weight. D. double. B - 12. If you weigh yourself in an elevator that is falling, compared to your ordinary weight you would weigh A. the same C. more. B. less. D. Cannot determine. 13. The gravitational force betwen you and an alien that is a billion miles away is A. dependent on the mass of the alien. C. very tiny, but not zero. B. zero. D. Two of the above. True/False If the statement is true, write "true. " If the statement is false, write "false, " and correct the underlined part to make the statement true. IF YOU DO NOT CORRECT THE FALSE STATEMENT, IT WILL BE MARKED WRONG. 14. If the sun were to collapse into a black hole, the Earth would still orbit as it is now. F 15. If light crosses or enters past the event horizon (or boundary) of a black hole, it can escape. 16. As the mass of a planet increases, the sun's force of gravity on the planet decreases. cannot T 17. A kind of force field that surrounds massive objects is called a gravitational field. increases 18. If Earth were its present size but had more mass, we would weigh less. more 1 19. The component of an orbiting satellite's velocity parallel to Earth's surface is called its tangential velocity. T 20. If the distance between the Earth & the moon decreases, the force of gravity between them would increase. NTRY SOL NTER 3 ( - ) N V