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Homework Help: Absolute pressure at an ocean depth

  1. Jan 4, 2008 #1
    a) Calculate the pressure at an ocean depth of 550 m. Assume that the density of sea water is 1022 kg/m3 and that the air above exerts a pressure of 101.3 kPa.
    b) At this depth, what force must the frame around a circular submarine porthole having a diameter of 32.0 cm exert to counterbalance the force exerted by the water?

    I found the answer for (a) to be 5609880 Pa, but I am stuck on part (b).
  2. jcsd
  3. Jan 4, 2008 #2


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    Assuming the inside of the sub is at atmospheric pressure all you need is the water pressure at that depth.
    Since pressure is force / area. You have the pressure,you can get the area of the porthole so hat is the force?
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