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Fluid mechanics :fluid in motion 
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#1
Apr2410, 05:07 AM

P: 16

1. The problem statement, all variables and given/known data
a vertical, 1cmdiameter 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 


#2
Apr2510, 09:26 AM

P: 16

found it



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