Posted by **Lindsey** on Wednesday, January 6, 2010 at 10:50pm.

A cube of oak with sides 15cm long floats upright in water with 10.5cm of its depth submerged. What is the density of the oak?

- Physics -
**drwls**, Wednesday, January 6, 2010 at 11:29pm
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

- Physics -
**someone**, Thursday, August 18, 2016 at 2:55am
Part inside = 10.5 /15

And inside also equal to d1/d2

And u get the answer 0.70

G/cm3

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