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

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Homework Help Overview

The discussion revolves around a physics problem involving a horizontal jet of water directed at a vertical wall. Participants are exploring the forces exerted on the wall due to the water jet, specifically focusing on the rate of change of momentum and the resulting force.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are attempting to calculate the rate of change of momentum and the force on the wall. Questions about the interpretation of the problem and the theoretical aspects are being raised, particularly regarding the understanding of momentum before and after the water impacts the wall.

Discussion Status

Some participants have made progress on part of the problem, specifically in calculating momentum, while others express confusion about the theoretical implications of the question. Hints have been provided to guide understanding of the momentum changes involved.

Contextual Notes

There is a request for the complete problem statement, indicating that some information may be missing or unclear. Participants are also navigating the distinction between practical calculations and theoretical understanding.

gidra
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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
 
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Please post the complete problem exactly as it was given.
 
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
 
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?
 
I worked out part a, I'm stuck with the theoratic part now. Can't really understand the question. Thanks for your replies btw
 
I'm not sure I understand. You completed part a? And you're stuck on part b?
 

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