Question

niter tof each question. 1. If you push twice as hard against a stationary brick wall, the amount of work you do on the wall A) quadruples. B) doubles. C) is cut in half. D) remains constant but non-zero. E) remains constant at zero. 2. The work done by the centripetal force on an object with a mass of 1 kg moving with a constant velocity of 4 m/s into a circular path of radius 0.6 m for one full cycle is A) 100.7J B)3.8J CJ D)40J E)80J 3. If the net work done on an object is zero, then the object's kinetic energy A) decreases. B) remains the same. c) increases. D) įs zero. E) cannot be determined without knowing the object's mass. 4. A 1500-kg car accelerates from 0 to 25 m's in 7.0 s. What is the average power delivered by the engine? A) 37000 W B) 45000 W c) 52000 W D) 60000 W E) 67000 W 5. At what speed must a 150-kg football player be moving to have the same momentum as a 15.0-g bullet traveling at 300 m/s? A) 10.0 m's B) 0.0300 m/s C) 3.00 m/s D) 30.0 m/s E) 1.00 m/s 6. A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion A) İs zero. B) moves horizontally. D) moves along a parabolic path. C) moves vertically.

help

Answer 1

Answer 1)

Option e- Zero (Since displacement is zero)

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Answer 2) Option C- 0J

Since, W= FS cos theta, here theta=90 degrees

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Ans3) option b- remains the same (acc to work energy theorem)

Acc to HOMEWORKLIB RULES, I can answer these many questions at a time only. Good luck!:)