A 10,000-kg rocket blasts off from earth with a uniform upward acceleration of 2.00 m/s2 and feels no air resistance. The upward thrust force its engines must provide during this acceleration is closest to
A) 20,000 N.
B) 980,000 N.
C) 118,000 N.
D) 78,000 N.
Answer: C
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A brake pad is used to give a normal force of 150N to the outer surface of a 0.25kg spinning disk, in order to slow it down from 250rpm to rest. The disk’s radius is 0.25m. If the coefficient of friction between the pad and the disk is 0.45, how much time was required for the disk to slow from 250 rpm to rest?
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A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the
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