Register to reply

Fluid mechanics :fluid in motion

by gikwiye
Tags: fluid, mechanics, motion
Share this thread:
gikwiye
#1
Apr24-10, 05:07 AM
P: 16
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*rČ
F=mg
P=(rho*UČ)/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*UČ)/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
Phys.Org News Partner Science news on Phys.org
Scientists develop 'electronic nose' for rapid detection of C. diff infection
Why plants in the office make us more productive
Tesla Motors dealing as states play factory poker
gikwiye
#2
Apr25-10, 09:26 AM
P: 16
found it


Register to reply

Related Discussions
Need Hmwk Help ASAP. Fluid mechanics, Fluids in Motion, Pressure Introductory Physics Homework 2
Need MORE Hmwk help ASAP. Fluid mechanics, Fluids in motion, pressure Introductory Physics Homework 8
Fluid Mechanics - Equations of motion circular flows Classical Physics 9
Fluid Mechanics Introductory Physics Homework 3