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
${{VR{}^2} \over {{n^3}{r^2}}}$
${{{V^2}R} \over {nr}}$
${{V{R^2}} \over {{n^2}{r^2}}}$
${{V{R^2}} \over {n{r^2}}}$
Solution
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