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Fluid mechanics :fluid in motion

  1. Apr 24, 2010 #1
    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
     
    Last edited: Apr 24, 2010
  2. jcsd
  3. Apr 25, 2010 #2
    found it
     
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