Question

An object has a mass of 80kg and a volume of 20m^3. Calculate its density.

Answer 1

Answer:

Density = Mass / Volume

= 80/20

= 4kg/m³

Answer 2

Answer:

Relative density of a substance is the ratio of its density to the density of a reference substance. In this case, the reference substance is water.

That is, Relative density=

$\frac{density \: of \: the \: object}{density \: of \: water}$

It is known that the density of water is 1000kg/m³ and the relative density is given as 0.52.

Substituting these values in the above formula, we get the density of the substance.

That is, Density of the substance = 0.52×1000kg/m³= 520kg/m³.

The mass of a body is calculated from the formula, Mass=Density×Volume. The volume of the substance is given as 2m³.

Therefore, Mass of the substance = 520/m³ × 2m³ = 1040 kg

therefore,X=1040kg