Mass of the cube is 15 g and length of each side of the cube is 50.0 mm.
First calculate volume of cube as follows:
[tex]V=a^{3}[/tex]
Here, a is length of each side of the cube.
Putting the value,
[tex]V=(50.0 mm)^{3}=1.25\times 10^{5} mm^{3}[/tex]
Now, density is defined as mass per unit volume, thus,
[tex]d=\frac{m}{V}[/tex]
Putting the values,
[tex]d=\frac{(15 g)}{(1.25\times 10^{5} mm^{3} } =0.00012 g/mm^{3}[/tex]
Therefore, density of cube is [tex]0.00012 g/mm^{3}[/tex].
