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Question

A solid uniform disk of mass m and radius R is pivoted about a horizontal axis through its centre and a small body of mass m is attached to the rim of the disk. If the disk is released from rest with the small body, initially at the same level as the centre, find the angular velocity when the small body reaches the lowest point of the disk.

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Solution

By conservation of energy,
kinitial+uinitial=kfinal+ufinal
ufinal=0;uinitial=mgR
0+mgR=kf+0
kf=12Iω2f=12(12mR2+mR2)ω2f
=12×32mR2ω2
mgR=12×32mR2ω2
ω=4g3R

1146073_986267_ans_466b60035e6e45c1ac2fa77710bdc5db.JPG

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