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Homework Help: Hydrostatic problem help

  1. Jun 30, 2009 #1
    1. The problem statement, all variables and given/known data

    A Cylinder got ratio of 15 cm, and h=15. Their mass=7kg. This is floating in water. After we put oil on it (density=725kg/m^3), on the water.
    Calculate whats the height of cylinder when its in oil.


    2. Relevant equations

    F=D x V x g

    3. The attempt at a solution
    I tried everything

    Help please...

    Sorry for my english.
  2. jcsd
  3. Jun 30, 2009 #2

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    Homework Helper

    Re: Hydrostatic

    Hi, welcome to PF.

    I think you mean "radius"...

    So now that you know the volume and the height, and also the mass, you can calculate the density.
    F is the weight of the cylinder. Now it is surrounded by oil, which is exerting a buoyant force on it.
    Did you try Archimedes' principle? Do that now.
    Last edited: Jun 30, 2009
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