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Q.

A solid metallic disc is spinning freely about its own geometrical axis passing through its centre and perpendicular to the plane of the disc. If some heat is supplied to the disc

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a

Its kinetic energy of rotation remains conserved

b

Its angular velocity remains unchanged

c

Its angular momentum remains conserved

d

Its kinetic energy increases

answer is C.

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Detailed Solution

No external torque is acting on the disc. Therefore, its angular momentum remains conserved.

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