Q.

A uniform rod O A of length l, resting on smooth surface is slightly disturbed from its vertical position. P is a point on the rod whose locus is a circle during the subsequent motion of the rod. The velocity of end O when end A hits the ground is

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a

         (1) zero

 

 

 

b

         (2) along the horizontal

c

         (3) along the vertical

d

         (4) at some inclination to the ground 90°

answer is A.

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Detailed Solution

Instantaneous axis of rotation will pass through O.

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V0=0

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