12.A mass hangs from a spring that is fixed to the ceiling. The mass is now pull

Question

12.A mass hangs from a spring that is fixed to the ceiling. The mass is now pulled down and released so the mass oscillates up and down. Which of the following statements is true?A.The kinetic energy of the oscillating mass is a constant.B.Adding mass to the spring will make it oscillate faster.C.The restoring force of the spring is equal to the weight of themass.D.The gravitational force on the mass oscillates at the same frequency as the mass.E.None of these is true.13.Jim exerts a force of 500 N against a 100-kg desk that does not move. Virgil exerts a force of 400 N against a 60-kg desk that moves 2 m in the direction of the push. Mik exerts a force of 200 N against a 50-kg desk that moves 5 m in the direction of the push. The most work is done by

Explanation / Answer

A. KE energy changes with time.
False

B. Adding mass.
m w^2 = k

so adding mass will decrease the frequency. hence slower.

False

C. False ( restoring forces changes with time)

D. False

hence Ans(E) .

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13. Work done = F.d

for jim, d = 0 hence W = 0

for Virgil, W = 400 * 2 = 800 J

for Mik, W= 200 * 5 = 1000 J

hence most work is done by mik. 1

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