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Fluid mechanics problem, need explanation please

  1. Aug 27, 2013 #1
    Hi please check the highlighted question in the attachment and the solution and see the problem, i need help please. I have two questions about it:

    1- why didn't we take the plug as a vertical wall and thus the force would be integral of pressure x area?

    2-WHERE DID THE FORCE DUE TO ATMOSPHERIC PRESSURE GO?

    Thnx for your help.
     

    Attached Files:

  2. jcsd
  3. Aug 27, 2013 #2

    tiny-tim

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    Hi Bassel! Welcome to PF! :smile:
    You did.

    You did ∫ ρgA(H+h) dh, but the plug is so small that you can take H+h to be a constant, H …

    so that integral is just ∫ ρgAH dh :wink:
    it nipped round the other side when you weren't looking, and started pushing back :smile:

    (so it's the same on both sides, and you can ignore it)
     
  4. Aug 27, 2013 #3
    by the other side you mean from outside ??
     
  5. Aug 27, 2013 #4

    tiny-tim

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    yes, the plug has two sides :smile:
     
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