JEE Main Physics question
A circular platform 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 . 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 will vary with time as
Answer: (B)
Solution
The tortoise's distance from the axis first decreases (reaching a minimum at the chord's midpoint) then increases back to the edge value, so the platform's moment of
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