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A uniform metallic rod rotates about it...

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

A

its speed of rotation increases

B

its speed rotation decreases

C

its speed of rotation remains same

D

its speed increase because its moment of inertia increases

Text Solution

Verified by Experts

The correct Answer is:
B
As the rod is heated, it expands. No external torque is ating on the system so angular momentm should be conserved.

L = Angular momentum
`Iomega=` constant
`rArr" "I_(1)omega_(1)=I_(2)omega_(2)`
So, angular velocity (speed of rotation) decreases.
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