A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated, uniformly to raise its temperature slightly

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its speed of rotation increases

its KE of rotation decreases

its speed of rotation remains same

its speed increases because its moment of inertia increases.

answer is B.

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Detailed Solution

As externl torque is zero, angular momentum (L) of the rod remains conserved. Now I = 1/12 ml² and KE = L²/2IDue to thermal expansion, l increases, so KE decreases.

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