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Q.

The velocity of flow of a liquid through a pipe at a point of radius r is v.  At a point where the radius is 2r, the mass of the liquid flowing out per second is (d = density of the liquid)

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a

2πr2vd

b

4πr2vd

c

πr2vd

d

πr2vd4

answer is C.

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Detailed Solution

mt=vρt=A×ℓtρ=Avρ=πr2vρ
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