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Solution


Q.

A thin circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with angular velocity ω. If another disc of the same dimensions but of mass M/2 is placed gently on the first disc co-axially, then the new angular velocity of the system is _____.           [2024]
1 45ω  
2 23ω  
3 54ω  
4 32ω  

Ans.

(2)