Multiple Choice On the blank write the CAPITAL letter of the best answer choice. Also circle the letter of the best answer. 1. If the mass of the Earth was cut in half, and the radius of the Earth was cut in half, the force of gravity between you and the Earth would be times the original force. A. 1/4 C. 1/2 B. 4 D. 2 3 2. Which has the greatest effect on our ocean tides? A. the distance to the sun C. the mass of the sun B. the distance to the moon D. the mass of the moon 3 . If you went up a very tall ladder that was as long as the radius of the Earth (i.e. If you were at a point 2R from the center of the Earth), your weight would A. increase. B. decrease by a half. C. be near zero (since in space). D. decrease by a fourth. 4. If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh A. less, but more than zero C. zero B. the same D. more 5. If you weighed yourself on another plannet that was the same size, but had less mass than Earth (i.e. the planet is less dense than the Earth) your weight on the planet would be _ your weight on Earth. A. less than C. the same as B. more than D. Unable to determine. 6. If the sun were to collapse to form a black hole (quite unlikely), Earth would A. fly off in a straight line C. spiral into the black hole B. orbit the black hole just as it orbits the D. None of these. sun now 7. A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force, if either, is greater? A. The force of B on A, C. Cannot determine. B. The force of A on B D. Both forces are the same. A 8. In the PhET Lab, you could change all of the following EXCEPT A. the force of gravity between objects C. the mass of the pink planet B. the masse of the blue planet D. the distance between the objects A The gravitational field strength at the center of Earth is A. the same as on the surface C. zero smaller than on the surface but still larger D. large than zero