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Homework Help: Fluid dynamics question

  1. Dec 9, 2012 #1
    1. The problem statement, all variables and given/known data

    water in main pipe at the street level is at a gauge pressure of 170 KPa and is moving with neglibible speed. A pipe connected to the main pipe is used to deliver the water to kitchen located on the third floor of a building, at a 15-m height from the street level. what is the maximum possible velocity with which the water can emerge from an open kitchen faucet?

    2. Relevant equations

    p1+1/2 rho G v^2+rho G H = p2 + 1/2 rho G v^2 + rho G H

    3. The attempt at a solution

    i have the equation p1=p2+1/2(rho)GV^2+(rho)G H
    since p1 speed is negligible and height is 0. im not sure abount what p2 is. is it the atmosphere pressure?
    the answer is 6.8m/s, but i cant get the answer. pls help
  2. jcsd
  3. Dec 9, 2012 #2


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    Science Advisor
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    Gold Member

    A spare couple of Gs in there.
    P1 is given as gauge pressure, which means it's the additional pressure beyond atmospheric. So what do you think you should use for P2?
  4. Dec 9, 2012 #3
    ok i got this ... i got the equation wrong
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