David Sang and Graham Jones Solutions for Chapter: Matter and Materials, Exercise 2: Questions

A cube of copper has a mass of $240 \mathrm{g}$. Each side of the cube is $3.0 \mathrm{cm}$ long. Calculate the density of copper in ${\mathrm{gcm}}^{-3}$ and in ${\mathrm{kgm}}^{-3}$.

The density of steel is $7850 \mathrm{kg}{ \mathrm{m}}^{-3}$. Calculate the mass of a steel sphere of radius $0.15 \mathrm{m}$. (First, calculate the volume of the sphere using the formula $V=\frac{4}{3}\pi r^3$ and then use the density equation.)