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Fluids and Density

  1. Feb 11, 2012 #1
    1. The problem statement, all variables and given/known data

    A block of wood with volume V floats in water with 0.67V submerged. In oil the block floats with 0.88V of its volume submerged.
    (a) Find the density of the wood.


    (b) Find the density of the oil.


    I honestly have no idea where to begin. I started off with FB = pVg. rearranged it to p = FB/Vg. Plugged in p = Fb/(0.67V)(9.81). That's all the further I got. We won't even get to this in lecture but the prof still insists we do this webassign.
  2. jcsd
  3. Feb 11, 2012 #2
    Hint: If the density of the block of wood exactly equals to that of water and is careflully placed in the water, what part of the wood would be under water?
  4. Feb 11, 2012 #3
    wow. that was so easy I almost feel embarrassed now. Thanks for the help though
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