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Review Questions
Chapter 22, Part 2 – Planetary Motion

  1. Explain the contributions of each person:
    1. Copernicus -
    2. Tycho Brahe –
    3. Kepler –
    4. Newton –
    5. Ptolemy –
    6. Galileo –
  1. Explain Kepler’s first two laws fully. Make a diagram of each and label it.
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  3. What does Kepler’s third law of planetary motion state?
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  5. If the distance to Planet X is 4,000 AU, which is the period? Show all work!
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  7. Galileo proved that our solar system was not geometric. What did he discover and how did he prove it?
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  9. What does Issac Newton’s Universal Law of Gravitation state?
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  11. What happens to the force of gravity between the two objects if their distance increases?
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  13. What happens to the force of gravity between the two objects if their size increases?
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  15. What is the difference between an ellipse and a circle? Which is the shape that the planets follow in their orbits?
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  17. Draw a picture of Ptolemy’s vision of the solar system, and label it.
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  19. What is retrograde motion?
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  21. Why did ancient peoples believe the Earth was the center of the universe?