A thin uniform circular disc of mass \( M \) and radius \( R \) is ...

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A thin uniform 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 an angular velocity \( \omega \). Another disc
P of the same dimensions but of mass \( M / 4 \) is placed gently on the first

W disc coaxially. The angular velocity of the system now is \( 2 \omega / \sqrt{5} \).
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