1.

One end of a uniform rod of length l and mass m is hinged at A. It is released from rest from horizontal position AB as shown in figure. The force exerted by the rod on the hinge when it becomes vertical is A. `(3)/(2)mg`B. `(5)/(2)mg`C. 3mgD. 5mg

Answer» Correct Answer - B
`U_(1)=(1)/(2)QE`
`U_(2)=QE`
`U_(1),U_(2)=1 : 2`
Note : Energy dissipated as heat `=U_(2)-U_(1)=(1)/(2)QE`


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