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Homework Help: Pressure Underwater

  1. Oct 6, 2009 #1
    1. The problem statement, all variables and given/known data
    (a) Calculate the absolute pressure at an ocean depth of 500 m. Assume the density of sea water is 1024 kg/m3 and that the air above exerts a pressure of 101.3 kPa. --I got this one its 5118900 Pa or N/m

    (b) At this depth, what force must the frame around a circular submarine porthole having a diameter of 28.0 cm exert to counterbalance the force exerted by the water?

    2. Relevant equations


    3. The attempt at a solution
    F= (5118900)(pi*.28^2)=1.26e6

    Thing is this is wrong and I have no idea why. Can someone enlighten me?
  2. jcsd
  3. Oct 6, 2009 #2
    Check your area of the circle equation. I think you are missing something there.

  4. Oct 6, 2009 #3
    OH gosh i put in the diameter rather than the radius thanks so much
  5. Oct 6, 2009 #4
    Or you can keep the diameter. It is simply (pi*D^2)/4

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