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Need help with this problem

  1. Apr 3, 2008 #1
    1. The problem statement, all variables and given/known data

    A vertical water pipe extends from the bottom to the top of the World Trade Center in the Big Apple (New York City), a distance of about 420 m. Calculate the difference in pressure in atm between the bottom and the top of the water pipe.

    2. Relevant equations

    p(y) = p - [tex]\rho[/tex]gy

    3. The attempt at a solution

    [tex]\rho[/tex]gy = (1 kg/[tex]m^{3}[/tex]) (9.81m/[tex]s^{2}[/tex]) (420m)
    [tex]\rho[/tex]gy = 4120.2 Pa
    4120.2 Pa (1 atm / 101300 Pa) = .0407 atm

    The answer above was wrong. Thanks for the help!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 3, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    The density of water isn't 1kg/m^3. It's 1000kg/m^3!
     
  4. Apr 3, 2008 #3
    ohhh, thats what was wrong. thanks a lot! :smile:
     
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