A 23.0 kg iron weightlifting plate has a volume of 2920 cm3. what is the density of the iron plate in g/cm3?

The first thing you should know for this case is that density is defined as the quotient between mass and volume:

D = M / V

In addition, you should keep in mind the following conversion:

1Kg = 1000g

Substituting the values we have:

D = (23.0 * 1000) / (2920) = 7.88 g / cm ^ 3

answer

the density of the iron plate is 7.88 g / cm ^ 3