During a basketball game, a player shoots a ball from half-court. When the ball reaches a height of 4.5 m above the floor, it is moving at 5.0m/s. If the ball was released from 2.5 m above the floor, what was the angle above the horizontal of the ball’s initial velocity?
a. 
b. 
c. 
d. 
e. 
f. 
f.
Physics & Space Science
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A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
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What will be an ideal response?
Physics & Space Science
Mercury's average density is about as high as Earth's. This is most likely because
A. it is composed of material blasted off Earth in a collision. B. it is highly compressed by its own gravity. C. unlike Earth, it does not have a (light) atmosphere that lowers its average density. D. it contains a significantly higher fraction of iron than Earth.
Physics & Space Science