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1
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2
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- Question 1 (1 point)As you're going to sleep early one night
you notice the rising moon in the center of the constellation Aries. You
get up early the next morning before sunrise to do some flyfishing. The
moon is still in the sky, although getting ready to set in the west.
What constellation is it in?
a.Aries. b.Cancer. c.Gemini. d.Taurus.
e.Pisces.
- Why? Because during one night, essentially all the motion of objects in
the sky is due to the Earth’s rotation, and everything turns
together.
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3
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- Question 2 Tycho Brahe's greatest contribution to astronomy
was
a.his 20 years of careful observations of planetary positions.
- b.his model of the universe.
- c.his telescopic observations of the moon.
- d.his discovery of three laws of motion
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4
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- Question 3 (1 point) If a space probe were sent into an
orbit around the sun that brought it as close as 0.5 AU to the sun and
as far away as 5.5 AU, what would be the semimajor axis of its
orbit?
a. 0.5 AU b. 3.0 AU c. 5.5 AU d. 6.0 AU
- Question 4 (1
point) If a space probe were sent into an orbit around the sun that
brought it as close as 0.5 AU to the sun and as far away as 5.5 AU, what
would be its orbital period?
a.1.0 years b. 2.5 years c. 4.1 years d. 5.2 years
- Use Kepler’s third law: P2 = a3 for both
these problems. Use units of
years and AUs to make life simple.
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5
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- Question 5 (1 point) An asteroid has an orbital period
around the sun of 5.2 years. Using Kepler's third law, how far from the
sun is this asteroid?
a.5.2 AU b.10.4 AU c.27.0 AU d.3.0 AU
e.2.3 AU
- Again just Kepler’s third law and some math. Will work on board in review
session.
- Question 6. While all of the following are
discoveries of Galileo, which of the four listed is NOT one which
DIRECTLY contradicts the "Aristotelian" view of the heavens.
- a.The discovery of "imperfections" on celestial bodies, such
as mountains and valleys on the moon and changing sunspots on the sun.
- b.The discovery of the phases of Venus, ranging from new to crescent to
"quarter" to gibbous to full.
- c.The discovery that the Milky Way is actually composed of a large
number of very faint stars.
- d.The discovery of four moons orbiting Jupiter.
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6
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- Question 7 (1 point) Newton concluded that some force had to
act on the moon because
- a. the moon moved at a constant velocity.
- b. a force is needed to pull the moon outward.
- c. a force is needed to pull the moon away from straight-line motion.
- d. a force is needed to keep the moon in motion.
- e. all of the above.
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7
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- Question 8 (1 point) What is the circular velocity of
Mercury? You will need values from Appendix A of the textbook. You might
also find the example in By the Numbers 4-1.
a. About 5 km/s.
- b. About 25 km/s.
- c. About 50 km/s.
- d. About 75 km/s.
- e.About 100 km/s.
- Start From Vc = (GM/R)0.5
- G = 6.67x10-11 m3/kg s2, M=2x1030
kg, R=5.8x107 km
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Notes
