1) You use your hand to stretch a spring to a displacement x from its equilibriu

Question

1) You use your hand to stretch a spring to a displacement x from its equilibrium position and then slowly bring it back to that position. Which is true? a) The spring's change in U is positive b) The spring's change in U is negative c) The hand's change in U is positive d)The hand's change in U is negative e) None of the above statements is true 2)In the previous question, what is the work done by the hand? a)-(.5)kx^2 b)+(.5)kx^2 c)(.5)mv^2 where v is the speed of the hand d) zero e)none of the above

Explanation / Answer

dU = U final - U initial = 0 since it came back to equilibrium so e)
since dU = 0 W = 0 so d)

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