Question

A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

Answer 1

Answer on Question 40304, Physics, Mechanics | Kinematics | Dynamics

Question: A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

Solution. From the fact that it barely floats we can conclude, that its density is very close to the density of water, $\rho=1000$ g/m^{3}. Hence, its volume can be found as

$V=\frac{m}{\rho}=\frac{0.02\,kg}{1000\,kg/m^{3}}=2\cdot 10^{-5}\,m^{3}=20\,cm^{3}$