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  4. A pressure-pump has a horizontal tube of cross-sectional area 10 cm 2 for the outflow of water at a speed of 20 m / s. The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is: [given: density of water =1000 kg / m 3 ]

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Q. A pressure-pump has a horizontal tube of cross-sectional area $10\, cm ^2$ for the outflow of water at a speed of $20\, m / s$. The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is: [given : density of water $=1000\, kg / m ^3$ ]

JEE MainJEE Main 2022Mechanical Properties of Fluids

Solution:

$F =\rho a v^2=10^3 \times 10 \times 10^{-4} \times 20 \times 20$
$F =400$