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Q.

A horizontal pipe of non- uniform cross sectional area allows water to flow through it with a velocity 2m/s when pressure is 80 kpa at a point. If the velocity of flow has to be 4m/s at same other point. The pressure at that point should be

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a

63 k pa

b

74 k pa

c

87 k pa

d

53 k pa

answer is B.

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Detailed Solution

p1−p2=ρ2(v22−v12) 

=10002(42−22)=500(16−4)=500×12=6000

80,000−p2=6000⇒p2=74,000pa=74kpa 

 

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