MHT CET Physics question
A uniform disc is rotating in a horizontal plane about a vertical axis at the rate of rad/s. A bob of wax of mass 0.02 kg falls vertically on the disc and adheres to it at a distance of 0.05 m from the axis of rotation. If the new speed of rotation becomes 40 rev/minute, the moment of inertia of the disc is [MHT-CET 2019, MHT-CET 2019]
Answer: (A)
Solution
rad/s (50 rpm) and rpm rad/s; conservation of angular momentum with
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