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Pressure of fluid on submarine

  1. Dec 9, 2007 #1
    1. The problem statement, all variables and given/known data
    a miniature sub is lowered to a depth of 8.5 m in sea water of density 1030 kg/m^3. The interior of the sub is maintained at a pressure fo 1.00 atm. Find the net force that must be withstood by a 1.5 diameter hatch which leads to the insisde.


    2. Relevant equations
    F= PA P= p + density X gravity X Hight


    3. The attempt at a solution

    Change in Pressure = 0 so P= 1030 X 9.8 X8.5
     
  2. jcsd
  3. Dec 9, 2007 #2

    mgb_phys

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    Hint, there is also one atmosphere of pressure pushing down on top of the water, and one atmosphere of pressure pushing out from the inside of the sub.
     
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