JA horizontal disc rotating freely about a vertical axis through its centre makes 90 revolutions per minute A small piece of wax

Question

JA horizontal disc rotating freely about a vertical axis through its centre makes 90 revolutions per minute A small piece of wax of mass m falls vertically on the disc and sticks to it at a distance r from the axis If the number of revolutions per minute reduce to 60 then moment of inertia of disc is 1 mr 3 2 mr 72 mr 2 4 3 mr

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