A uniform disc of mass \( M \) and radius \( R \) is pivoted about ...

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A uniform disc of mass \( M \) and radius \( R \) is pivoted about the horizontal axis through its centre \( C \). A point mass \( m \) is glued to the disc at its rim, as shown in figure. If the system is released from
\( \mathrm{P} \) rest, find the angular velocity of the disc when \( m \) reaches the bottom point \( B \).

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