(a)[3]
There is $0.050\,\text{m}^3$ of pure water in the barrel. Pure water has a density of $1000\,\text{kg m}^{-3}$. Calculate the mass of the pure water in the barrel.
(b)[2]
Sea water has a density of $1030\,\text{kg m}^{-3}$. Plastic has a density of $1000\,\text{kg m}^{-3}$. Use this information together with the information in (a) to state and explain whether the full barrel will float in sea water.