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A100 -- Dan Swearingen
Homework 4 -- Due by the beginning of class on Tuesday October 22

Chapter 5, page 167

Questions for review 10: Why does the Moon form two tidal bulges on the Earth?

Chapter 5: Additional question: If it is sunrise and the moon is high in the sky, what phase must the moon be? Show why.

Essay 4, page E4-8, Questions for review

2. Why do the sidereal and the solar day differ in length?

4. Why isn't the solar day always exactly 24 hours long?

Chapter 6, page 191, Questions for review

5. What is the Oort cloud? Where is it located and what kinds of objects come from it?

8. What is the solar nebula? What is its shape and why?

9. Why are there two types of planets?

Chapter 6, page 192, Numerical Problems

1. Calculate the densities of Venus and Jupiter given the following data: The mass and radius of Venus are 4.87 x 1027 grams and 6,051 kilometers. The mass and radius of Jupiter are about 1.9 x 1030 grams and 71,492 kilometers. How do these numbers compare with the density of rock (silicon) about 3 grams per cc, and water at 1 gram per cc.

2. Look up the mass and radius of Mercury and Jupiter and calculate their escape velocity using the expression in chapter 2. Does this help explain why the one body has an atmosphere but the other doesn't?

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