A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heateduniformly to raise its temperature slightly, then [AIIMS 2015]

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its speed of rotation increases

its speed of rotation decreases

its speed of rotation rell1ains same

its speed increases because its moment of inertia increases

answer is B.

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Detailed Solution

When a metallic rod is heated, it expands. Its moment of inertia (I) about a perpendicular bisector increases. According to law of conservation of angular momentum, its angular speed (co) decreases, since ω∝1I

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