. A circular platform is free to rotate in a horizontal plane about a vertical axis passing through its center

A tortoise is sitting at the edge of the platform. Now, the platform is given an angular velocity w0. When the tortoise moves along a chord of the platform with a constant velocity (with respect to the platform), the angular velocity of the platform w (t) will vary with time t as  





Best Answer

Ans: B

Sol: The angular momentum (L) of the system is conserved i.e. L = Iw = constant

When the tortoise walks along a chord, it first moves closer to the centre and then away from the centre. Hence, M.I. first decreases and then increases. As a result, w will first increase and then decrease. Also the change in

will be non-linear function of time.

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