MHT CET 2025 Physics question
The moment of inertia of a ring about an axis passing through its centre and perpendicular to its plane is I. It is rotating with angular velocity w. Another identical ring is gently placed on it so that their centres coincide. If both the rings are rotating about the same axis then loss in kinetic energy is
Answer: (C)
Solution
There is no external torque, so angular momentum is conserved: , giving . Initial kinetic energy: . Final kinetic energy: . Loss in kinetic energy: $ - =
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