A uniform metallic rod rotates about its...

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

its speed of rotation increases

its speed rotation decreases

its speed of rotation remains same

its speed increase because its moment of inertia increases

Text Solution

Verified by Experts

The correct Answer is:

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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