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Question: A stream of water flowing horizontally with a speed of v gushes out of a tube of cross-sectional are...

A stream of water flowing horizontally with a speed of v gushes out of a tube of cross-sectional area A, and hits a vertical wall nearby. The force of impact on the wall when the water does not rebounds is -

A

Av 2

B

Av2r

C

Avr

D

Ar

Answer

Av2r

Explanation

Solution

F = v. dmdt\frac{dm}{dt} = v(Arv) = Arv2

[Note : dmdt\frac{dm}{dt} = mass flow rate = Arv]