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chp12_practice_solutions - proportional to your distance...

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CHP12 Practice Sheet SOLUTIONS 1. T 2. F 3. F 4. T 5. T 6. B 7. D 8. D 9. B 10. D 11. D 12. A 13. D 14. This New Earth’s new value of little g would be a) doubled by the Earth’s doubled mass and b) quadrupled by the Earth’s halved radius For a net increase by 8 times. We will all weigh 8 times more. This means less fun in the New World. (acceleration due to gravity: g = GM planet /(R planet ) 2 ) (and your weight is your mass times this acceleration due to gravity.) 15. Now instead of being a distance of R Earth from the center of the Earth, you are now at a distance equal to (3 R Earth ) from the Earth’s center. The gravitational force on you and your accelearation due to gravity is reduced by 9 times because they are inversely
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Unformatted text preview: proportional to your distance from the center of the Earth. 16. The moon is attracted towards the center of the Earth but it is moving tangentially with a speed that is too slow to escape the Earth’s pull, but fast enough to keep from being pulled inward. If you could “shut off” the Earth’s pull, the moon would go off in a straight line (due to a lack of centripetal force) and go further and further from Earth. The Earth’s pull is enough to keep the moon from escaping but not enough to pull it to Earth....
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