A fire hydrant delivers water of density ρ at a volume rate L . water travels vertically upwa

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9-1.Fluid Mechanics

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A fire hydrant delivers water of density $\rho $ at a volume rate $L$. The water travels vertically upward through the hydrant and then does $90^o$ turn to emerge horizontally at speed $V$. The pipe and nozzle have uniform cross-section throughout. The force exerted by the water on the corner of the hydrant is

A

$\rho VL$

B

zero

C

$2\rho VL$

D

$\sqrt 2 \rho VL$

Solution

here volume rate $=\mathrm{L}$

net force $=\sqrt{2} \rho \mathrm{VL}$

Standard 11

Physics

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