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Q.

A uniform rod of length l is pivoted at point A. It is struck by a horizontal force which delivers an impulse J at a distance x from point A as shown in figure, impulse delivered by pivot is zero, if x is equal to :
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a

2l3

b

l3

c

3l4

d

l2

answer is A.

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Detailed Solution

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large J = mv;;;;J.x = Iomega = frac{{m{l^2}}}{3}.omega
large v = frac{l}{2}omega ;;;x = frac{2}{3}l
 

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