Final answer:
To calculate the density of a rock, divide the rock's mass by its volume. For the first rock with a volume of 15 cm³ and a mass of 45 g, the density is 3 g/cm³. For the second rock with a volume of 30 cm³ and a mass of 60 g, the density is 2 g/cm³.
Step-by-step explanation:
The student is asking how to determine the density of a rock given its mass and volume. To find the density, you divide the mass of the rock by its volume. The density (D) is expressed as D = m/V.
- (a) For a rock with a volume of 15 cm³ and a mass of 45 g, its density is calculated as 45 g / 15 cm³ = 3 g/cm³.
- (b) For a different rock with a volume of 30 cm³ and a mass of 60 g, its density is determined by computing 60 g / 30 cm³ = 2 g/cm³.
By applying the same formula, you can solve similar problems by dividing the mass by the volume.