Question

A steam of water flowing horizontally
with a speed of 25ms gushes out of a
tube of cross-sectional area 102 m2,
and hits at a vertical wall nearby. What
is the force exerted on the wall by the
impact of water?​

Answer 1

Explanation:

The horizontal speed of the stream is,v=15m/s

The area of cross-section of the tube, A=10

−2

m

2

The Density of water is,=10

3

kg/m

3

The volume of water coming out from the pipe per second,

V=Av=15×10

−2

m

3

/s

Mass of water flowing out through the pipe per second = density×Volume=150kg/s

Since the water does not rebound from the wall, the force exerted by the water on the wall is given by:

F=Rate of change of momentum=

t

P

F=

t

mv

for t=1 s

F=150×15=2250N