What is the Force on a Wall from a Horizontal Water Jet?

[gidra]

It's my first time writing on this forum, hope I'm posting in the correct section.

Problem :

A hose directs a horizontal jet of water on to a vertical wall.

What is the force on the wall, under the above conditions ? Explain.

Thanks for any replies

 

[Doc Al]

Please post the complete problem exactly as it was given.

 

[gidra]

A hose directs a horizontal jet of water, moving with a velocity of 20ms^-1, on to a vertical wall. The cross-sectional area of the jet is 5 x 10^-4 m^2. If the density of water is 1000kg m^-3:

a) fin the rate of change of momentum as the water hits the wall, assuming that the water is brought to rest there;

b) what is the force on the wall, under the above conditions? Explain

 

[Doc Al]

That's better. Hints for a: How much water hits the wall every second? What's its momentum just before it hits the wall? What's its momentum just after hitting the wall? What's the change in momentum?

 

[gidra]

I worked out part a, I'm stuck with the theoratic part now. Can't really understand the question. Thanks for your replies btw

 

[Doc Al]

I'm not sure I understand. You completed part a? And you're stuck on part b?