- #1
Tom Hardy
- 46
- 1
Homework Statement
A vertical jet of water of 3cm in diameter impinges upon a horizontal flat plate with a velocity of 4m/s, and all of the water spreads out horizontally. Find the force exerted on the plate.
Homework Equations
The Attempt at a Solution
I am not 100% sure how to tackle this, from what I can understand understand it could have something to do with [tex] F=dp/dt [/tex] (p being momentum) but I am not sure how to work out the change in momentum. If we consider an element that is about to hit the plate with dimensions Area = [tex] \pi*(1.5*10^{-2})^2 [/tex] volume = [tex] 4*(\pi*(1.5*10^{-2})^2) [/tex] mass is the same value as volume so momentum would be [tex] 16*(\pi*(1.5*10^{-2})^2) [/tex] That's where I get up to, I mean the water goes sideways so how do I figure out it's momentum after, how does continuity play out here? :S Should I just take it after to be 0?
Many thanks