(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

a vertical, 1cm-diameter jet of water impinges upon a bathroom scale such that the latter exhibits a reading of 5 kg. Estimate the volume flow rate of the jet.

2. Relevant equations

p=F/A

Q(volume flow rate)=U*A(area where the jet of water is applied on)

a=pi*r²

F=mg

P=(rho*U²)/2 (if we consider that the pressure applied on the scale by the jet is essentially dynamic pressure) (don't know if this is correct though)

3. The attempt at a solution

let's calculate A first

A=2.5x10^(-5)*pi

then let's change the kg into Newtons:

F=5*9.81=49.05N

P is F/A therefore: P=49.05/(2.5*10^(-5))=624.523kpa

with P=(rho*U²)/2 if find U=35.341m/s

and with

Q(volume flow rate)=U*A(area where the jet of water is applied on)

I find Q=2.7756 l/s

just wanna know if I should include the atmospheric pressure or not

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Fluid mechanics :fluid in motion

**Physics Forums | Science Articles, Homework Help, Discussion**