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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a
its speed of rotation increases
b
its speed of rotation decreases
c
its speed of rotation rell1ains same
d
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