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Q.

A thin rod OA of length l is pivoted about a horizontal axis through its lower end O. Initially the rod is held in vertical position. Now the rod is released. What is the angular acceleration of the rod when it makes an angle 30o with vertical?

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a

2g3l

b

gl

c

3g4l

d

4g3l

answer is C.

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Detailed Solution

M = Moment of mg about O=mg.l2sin300=14mglIO=13ml2∴  α=MIO=14mgl13ml2=34gl
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