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An incompressible fluid flows steadily through a cylindrical pipe which has radius 2r at point A and radius r at B further along the flow direction. If the velocity at point A is v, its velocity at point B is

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a

2v

b

v

c

v/2

d

4v

answer is D.

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Detailed Solution

A1v1=A2v2 π2r2v=πr2v2 v2=4v

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