Questions

A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated

uniformly 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

detailed solution

Correct option is B

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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A disc rotates freely with rotational kinetic energy E about a normal axis through centre. A ring having the same radius but double the mass of disc is now, gently placed on the disc. The new rotational kinetic energy of the system would be

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