A ball is projected upward at time t = 0.00 s, from a point on a roof 70 m above the ground and experiences negligible air resistance. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 28.5 m/s
Consider all quantities as positive in the upward direction. The velocity of the ball when it is 39 m above the ground is closest to A) -38 m/s.
B) -30 m/s.
C) -23 m/s.
D) -15 m/s.
E) -45 m/s.
A
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A sound wave in helium has an intensity of 
The density of helium is 0.179
and the velocity of sound in helium is 965 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
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During the red giant phase, a star's mass ________
Fill in the blank(s) with correct word
If you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book?
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