The density of the foam rubber is 0.5 grams cm3. What volume does the foam rubber weighing 7.5 kilograms take?

ρ = 0.5 g / cm ^ 3 = 500 kg / m ^ 3.

m = 7.5 kg.

V -?

The density of a substance ρ is the ratio of the mass of a substance m to its volume V: ρ = m / V.

Let us express the volume of a substance from the formula: V = m / ρ.

V = 7.5 kg / 500 kg / m ^ 3 = 0.015 m ^ 3.

Answer: the volume of foam rubber with a mass of m = 7.5 kg is V = 0.015 m ^ 3.