A) its speed of rotation increases
B) its speed of rotation decreases
C) its speed of rotation remains same
D) its speed increases because its moment of inertia Increases
Correct Answer: B
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 \[(\omega )\]decreases, since \[mgh=\frac{1}{2}K{{X}^{2}}\] (according to law of conservation of angular momentum).
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