Question

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 = $1000 kg/m^3$].

• A. 300 N
• B. 500 N
• C. 250 N
• D. 400 N

Answer 1

Answer: (D)

400 N

Answer 2

F=$ρAv^2$=$10^3×10×10^{-4}×20×20$

F=$400 N$