Question

If a piece of wood having a total volume of 1.6 cubic metre and density of 800 kg per cubic metre floats on the water density 1000 kg per cubic metre. Calculate what part of the wood is in water?

Answer 1

Water displaced = mg
$1.6\times \text{/}800\times \text{/}10=\text{/}1000\times n^3\times \text{/}10n^3=1.28$
Portion of wood in water $=\frac{1.28}{1.6}\times 100=\frac{8}{10}\times 100=80\%$.