A uniform heavy disc is rotating at a constan | vedclass

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(C) The system consists of the disc and the plasticine lump.Since the plasticine is dropped vertically,there is no external torque acting on the syste

Vedclass · Accepted Answer

$L$ only

Vedclass · Answer

(C) The system consists of the disc and the plasticine lump.Since the plasticine is dropped vertically,there is no external torque acting on the system about the axis of rotation.According to the principle of conservation of angular momentum,if the net external torque acting on a system is zero,the angular momentum $L$ of the system remains constant.However,when the plasticine sticks to the disc,the moment of inertia $I$ of the system increases.Since $L = I\omega$ and $L$ is constant,the angular velocity $\omega$ must decrease.Therefore,only the angular momentum $L$ remains constant.

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