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Homework Help: Pressure problem

  1. Aug 21, 2011 #1
    1. The problem statement, all variables and given/known data
    At what depth a lake surface is the total pressure 3 times the normal atmospheric pressure?

    2. Relevant equations

    P=pgh this is the equation for liquid pressure.

    About total pressure we should add also the atmospheric pressure which is pushing from above the surface of the liquid.

    3. The attempt at a solution
    Pl + Patm=pgh
    so, 300kPa=1000kg/m3*10m/s2*h... the answer is 30m, but in the answer key is 20m.
    Last edited: Aug 21, 2011
  2. jcsd
  3. Aug 21, 2011 #2
    Thank you but don't need. Figured it out.Sorry for posting it too early.
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