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Fluids and Density

  • Thread starter scarne92
  • Start date
  • #1
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Homework Statement



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.


g/cm3

(b) Find the density of the oil.


g/cm3

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.
 

Answers and Replies

  • #2
1,198
5
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?
 
  • #3
6
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wow. that was so easy I almost feel embarrassed now. Thanks for the help though
 

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