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A uniform disc of mass M and radius R is...

A uniform disc of mass `M` and radius `R` is pivoted about a horizontal axis passing through its edge. It is released from rest with its centre of mass at the same height as the pivot.

A

The angular velocity of disc when its centre of mass is directly below the pivot is `sqrt((4g)/(3r))`

B

The force exerted by the pivot at this instant is `7/3mg`

C

Angular momentum of disc is conserved

D

Angular acceleration of disc at the given instant is zero

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The correct Answer is:
A, C
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