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Homework Help: Pressure Problem

  1. Nov 5, 2008 #1
    1. The problem statement, all variables and given/known data
    A submersible with internal pressure of 1 atmosphere is at a depth of 30 meter below the surface of the ocean. At this depth, what is the upward force required to open a hatch of area 0.75 m2. Assume density of sea water is 1030 kg/m3.
    2. Relevant equations
    P = Patm + ρgh
    F = P*A

    3. The attempt at a solution
    Do I have to add the atmospheric pressure on the surface of the ocean? I have this equation : Patm + ρgh = Pinternal + P2
    then F = P2 * A.
    is this approach right?
  2. jcsd
  3. Nov 5, 2008 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Yes, looks good.

    p.s. Welcome to PF.
  4. Nov 5, 2008 #3
    Thank you..
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