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Q.

A light rod of length L having a body of mass M attached to its end hangs vertically. It is turned through 90° so that it is horizontal and then released.Choose correct statement when the rod makes an angle θ with the vertical

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a

velocity of body = 2Lg sinθ

b

Centripetal acceleration = 2g cosθ

c

velocity of body = Lg cosθ

d

Centripetal acceleration = 2g sinθ

answer is B.

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Detailed Solution

Loss in Potential energy = Gain in Kinetic Energy⇒MgLcosθ=12Mv2⇒v=2gLcosθ Centripetal acceleration =v2L=2gLcosθL=2gcosθ
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