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A circular plarform is free to rotate in...

A circular plarform is free to rotate in a horizontal plane about a vertical axis passing through its centre. A tortoise is sitting at the edge of the platform. Now, the platform is given an angular velocity `omega_0`. When the tortoise move along a chord of the platform with a constant velocity (with respect to the platform), the angular velocity of the platform `omega(t)` will vary with time t as

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Since there is no external
torque, angular momentum
remains conserved. As
moment of inertia initially
decreases and then
increases, so `omega` will increase
initially and then decreases.
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