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Question

The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is:


A

VR2n3r2

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B

VR2nr

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C

VR2n2r2

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D

VR2nr2

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Solution

The correct option is D

VR2nr2


Apply equation of continuity

A1v1=A2v2

πR2V=nπr2u

u=VR2nr2


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