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Hydrostatics - Which point has higher pressure?

  1. Jan 16, 2010 #1

    IBY

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    Just a little question. Say a boat is floating on water. Imagine now two points in the shallow, flat sea floor. One is below the ship and the other is just water all the way up. Which point has higher pressure?

    I am imagining that both points have the same pressure due to the concept of hydrostatic pressure:
    [tex]\rho g h[/tex]
    But still, I have a little doubt. Wouldn't the boat add a little more pressure along with the atmospheric one?
     
  2. jcsd
  3. Jan 16, 2010 #2

    PhanthomJay

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    Re: Hydrostatic

    you are correct
    Unlike solids or soils, water is almost incompressible, so for all intent and pupose, it would not add pressure
    the pressure at the given point in the water is the sum of the atmospheric pressure plus the water 'gauge' pressure you noted in your equation.
     
  4. Jan 16, 2010 #3
    Re: Hydrostatic

    The pressures are equal. The boat acts as though it is the volume of water it displaces.
     
  5. Jan 16, 2010 #4

    IBY

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    Re: Hydrostatic

    Thanks!
     
  6. Jan 16, 2010 #5

    ehild

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    Re: Hydrostatic

    Think: part of the boat is under water, so the height of the water column beneath it is less than h.

    ehild
     
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