JEE Main 2011 Physics question
A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc:
Answer: (3)
Solution
Angular momentum is conserved (no external torque). As the insect moves towards the centre, the moment of inertia of
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