Step 1 :The density of a material is calculated by the formula: Density = Mass / Volume.
Step 2 :Given that the cube measures 3.60 cm on a side, the volume of the cube can be calculated using the formula for the volume of a cube: Volume = side^3.
Step 3 :First, calculate the volume of the cube: \(3.60^3 = 46.656 \, \mathrm{cm^3}\).
Step 4 :Then, use the calculated volume to find the density: \(\frac{3.19 \, \mathrm{g}}{46.656 \, \mathrm{cm^3}} = 0.06837277091906721 \, \mathrm{g/cm^3}\).
Step 5 :However, the question asks for the answer to be written to the correct number of significant figures. The given values, 3.19 g and 3.60 cm, both have three significant figures. Therefore, the density should also be reported with three significant figures.
Step 6 :Final Answer: The density of the unknown material is \(\boxed{0.068 \, \mathrm{g/cm^3}}\).