Answer:
The average density of the material from which the coin is made is 9.67 g/cm³.
Volume of the coin
The volume of the coin at the given diameter is calculated as follows;
V = Ah
where;
A is area of the coin
h is the thickness of the coin
V = πd²/4 x h
V = π(2.8)²/4 x (0.21 cm)
V = 1.293 cm³
average density of the coin
The average density of the material from which the coin is made is calculated as follows;
density = mass/volume
density = 12.5 g / (1.293 cm³)
density = 9.67 g/cm³
Thus, the average density of the material from which the coin is made is 9.67 g/cm³.
