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WBJEE 2014 Physics Solved Paper

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Question : 57

Total: 60

A thin rod AB is held horizontally so that it can freely rotate in a vertical plane about the end A as shown in the figure.The potential energy of the rod when it hangs vertically is taken to be zero. The end B of the rod is released from restfrom a horizontal position. At the instant the rod makes an angle θ with the horizontal.

the speed of end B is proportional to √sinθ
the potential energy is proportional to (1 - cosθ)
the angular acceleration is proportional to cos θ
the torque about A remains the same as its initial value

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