Physics System of Particles Rotational Motion All Topic Question for Revision Test MCQ (Single Correct)

A disc is free to rotate about a smooth horizontal axis passing through its center of mass. A particle is fixed at the top of the disc. A slight push is given to the disc and it starts rotating. During the process,

A
only mechanical energy is conserved
B
only angular momentum (about the axis of rotation) is conserved
C
Both mechanical energy and angular momentum are conserved
D
Neither the mechanical energy nor the angular momentum are conserved

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Text Solution

Verified by Experts
The correct answer is:
A

Angular momentum will not remain conserved due to the torque produced by weight of

particle acting about axis of rotation. Hence, only mechanical energy is conserved.

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