Q. A rod of mass and length can rotate about an axis passing through in vertical plane. A disc of mass and radius is hinged to the other end of the rod and can freely rotate about . When disc is at lowest point both rod and disc has angular velocity . If rod rotates by maximum angle with downward vertical, then in terms of and will be (all hinges are smooth)

System of Particles and Rotational Motion Report Error

A

B

C

D

none of these

Solution:

As hinges are smooth the disc continue to rotate at so by work energy theorem we use

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