Author Question: One of the predictions of Kepler's laws of planetary motion is that a) the planets move in ... (Read 55 times)

burchfield96 · **on:** Jul 28, 2018

One of the predictions of Kepler's laws of planetary
motion is that
a) the planets move in circular orbits.
b) for a non-circular orbit, the closer a planet is to the Sun the faster it travels.
c) planets nearer the Sun have the longest orbital periods.
d) all planets move in elliptical orbits around Earth.
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Question 2

A ball falls to the ground from height h and bounces to height h'. Momentum is conserved in the ball-earth system
a. no matter what height h' it reaches.
b. only if h' < h.
c. only if h' = h.
d. only if h' > h.
e. only if h' h.