A sinusoidal wave is generated by moving the end of a string up and down periodically.The generator does not supply any power when the end of the string
A)has its least acceleration
B)has its greatest displacement
C)has half its greatest displacement
D)has one fourth its greatest displacement
E)has its least displacement

Question

Quizplus · Accepted Answer

The generator does not supply any power when the end of the string has its greatest displacement because at this point, the velocity of the string is zero (it momentarily stops before changing direction), and power is related to the rate of doing work or energy transfer, which involves both force and velocity.

A Sinusoidal Wave Is Generated by Moving the End of a String