If you observe the night sky in the direction of the North Star, you will observe that
A) the other stars near the north star move along clockwise circles around the north star during the night.
B) the north star moves westward across the sky during the night.
C) the other stars near the north star move in straight lines from east to west during the night.
D) the other stars near the north star move along counterclockwise circles around the north star during the night.
E) the north star moves eastward across the sky during the night.
Question 2
Suppose we want a satellite to revolve around the earth 5 times a day. What should be the radius of its orbit? (The mass of the earth is 5.97 1024 kg, G = 6.67 10-11 N m2/kg2, and you can neglect the presence of the moon.)
A) 1.44 107 m
B) 0.690 107 m
C) 7.22 107 m
D) 2.11 107 m
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