homework4 - 10 Which object exerts a stronger gravitational...

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Physics 20A: Introduction to Astronomy Homework assignment #4 Due Oct. 22 1. Which is brighter, a 19th magnitude star or a 14th magnitude star? How many times brighter is it? 2. Textbook, p. 108, #2. 3. Textbook, p. 108, #6. 4. Textbook, p. 108, #7. 5. Textbook, p. 108, #10. 6. Textbook, p. 108, #15. 7. Textbook, p. 108, #16. 8. Textbook, p. 108, #17. 9. Explain briefly why Galileo’s observation of Venus in gibbous phases was a critical test that could distinguish between the geocentric and heliocentric models of the solar system.
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Unformatted text preview: 10. Which object exerts a stronger gravitational pull on your body: Venus or Jupiter? Since the distance between the Earth and each of these two planets varies over the course of the planets’ orbits, use the smallest distance between Earth and the planets for your calculation. For Venus, this distance is about 0.3 AU, and for Jupiter, it’s about 4.2 AU. Appendix 3A in your textbook lists the masses of the planets in units of Earth masses. 1...
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