Question R16 Q18 - NSB 2015

If a nonzero net torque is applied from an external source onto a frictionless rotating device, which of the following statements is NOT true?

W) The rotational velocity at some time t can be equal to zero after the torque begins.

X) The final total rotational energy of the system can be greater than the total work done by the net torque.

Y) The total momentum of the device is constant before and after the torque is applied.

Z) Any gravitational potential energy gained by the device due to rotation is lost upon completion of a full revolution.

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