Posted by Lindsey on Wednesday, January 6, 2010 at 10:50pm.
The weight of the oak equals the weight of a 15 x 15 x 10.5 cm block filled with water (since that is the buoyancy force). That is the displaced volume of water.
The density of the block is
(water density)x(15 x 15 x 10.5)/(15 x 15 x 15) = 1 x 10.5/15
= 0.70 gm/cm^3
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