m = 3.9 kilograms is the mass of the part;
V = 500 cubic centimeters – part volume.
It is required to determine what material the part is made of.
Let’s convert the volume from cubic centimeters to cubic meters:
V = 500 cm ^ 3 = 500 * 10 ^ -6 = 5 * 10 ^ -4 m ^ 3.
Let’s find the density of the metal from which the part is made:
ro = m / V = 3.9 / (5 * 10 ^ -4) = 0.78 * 10 ^ 4 = 7800 kg / m ^ 3.
According to the density table, we find that this value corresponds to iron.
Answer: the part is made of iron.
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