Questions
A solid uniform disc 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 disc. If the disc is released from rest with the small body, initially at the same level as the centre, the angular velocity when the small body reaches the lowest point of the disc is
detailed solution
Correct option is C
The conservation of energy yields∆KE + ∆PE= 0 12(12mR2)ω2 + 12m(ωR)2 + (-mgR)=0 ω= 4g3R;Talk to our academic expert!
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A uniform thin rod of length l and mass m is hinged at a distance l/4 from one of the end and released from horizontal position as shown in Fig. The angular velocity of the rod as it passes the vertical position is
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