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

Physics & Space Science

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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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C.

D.

E.

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