Suppose you live in the United States and you see a crescent moon in your evening sky tonight. What will a friend in South America see tonight?
A) a crescent moon
B) Your friend won't see the Moon tonight, because in South America, it will be visible only in the morning.
C) a gibbous moon
D) a first-quarter moon
A) a crescent moon
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The sum of orthogonal vectors V1 and V2 is (4i 2 8j 1 7k). A unit vector along V1 is (0.635i 1 0.773j). Vector V1 is:
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A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
