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A100 Dan Swearingen
Homework 2, Due Tuesday, September 24

Chapter 1

Pages 53-54, Questions For Review:

1. What is the celestial sphere?

2. What is a constellation?

3. What is the Zodiac?

4. What is the Ecliptic?

5. Where on the Celestial Sphere would you look for the planets?

6. How long does it take for the moon to go through a cycle of phases?

9. If you see a bright "star" in the sky, how could you tell whether it is a star and not, for example, Venus?

Page 54, Thought Questions and Problems:

1. If you were standing on Earth's equator, where would you look to see the north celestial pole?

Could you see this pole from Australia?

4. Can you think of an astronomical reason why the zodiac may have been divided into 12 signs rather than 8 or 16?

7. Why does the position of sunrise along the eastern horizon change during the year?

9. Suppose a planet were found with an orbital period of 64 years. How might you estimate its distance from the sun?

If the planet's orbit is circular, what is its radius?

Essay 1

Page E1-10, Questions:

1. Approximately where would you look for Mercury in the sky at 7 p.m.?

3. If a planet is at opposition and you see it straight overhead, what time of night must it be?

Chapter 2

Page 74

Questions For Review:

4. How does mass differ from weight?

5. If your mass is 70 kg on earth, what is it on the moon?

Thought Questions and Problems:

4. How much bigger is the earth's gravitational force on the moon than the moon's gravitational force on the earth? Think about Newton's third law of motion before answering this.

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