Question

A pressure pump has a horizontal tube with a cross-sectional area of 10 cm² 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/m³]

विकल्प

• 300 N

• 500 N

• 250 N

• 400 N

Answer 1

A pressure pump has a horizontal tube with a cross-sectional area of 10 cm² 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 400 N.

Explanation:

F = Momentum transferred by water per sec.

= ρaV × V

F = `rhoA"v"^2 = 10^3 xx 10 xx 10^-4 xx 20 xx 20`

F = 400 N