MHT CET 2024 Physics question
A thin uniform circular disc of mass 'M' and radius 'R' is rotating with angular velocity ' ' in a horizontal place about an axis passing through its centre and perpendicular to its plane. Another disc of same radius but of mass is placed gently on the first disc co-axially. Then n angular velocity will be
Answer: (B)
Solution
No external torque acts about the common axis, so angular momentum is conserved: . For discs , so and . Then $ω' =
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