1. What did Galileo discover which supported the Copernican model? Explain.
2. What was Tycho Brahe's contribution to the advancement of astronomy?
3. State Kepler's three laws of planetary motion.
4. What is meant by saying that Kepler's laws are empirical?
8. In what sense does a baseball fall to Earth rather than the Earth fall on the baseball?
9. Why would a baseball thrown with the same upward speed go higher on the Moon than the Earth?
10. Define 'Escape Speed'.