Question

The density of copper is 9.86 g/cm3.

Work out the mass of the solid copper cuboid in kg.
the cube is shown up above ..... please someone help me

Answer 1

The mass of copper cuboid is 1479g.

Explanation:

First you have to find the volume od cuboid using the formula V = length×width×height :

`v = length * width * height`

`let \: length = 5 \\ let \: width = 10 \\ let \: height = 3`

`v = 5 * 10 * 3`

`v = 150 {cm}^(3)`

Then you have to substitute the volume into the formula of density, ρ = mass/volume :

`ρ = mass * volume`

`let \: density = 9.86 \\ let \: volume = 150`

`9.86 = (mass)/(150)`

`mass = 9.86 * 150`

`mass = 1479g`

Answer 2

1.479 kg

Explanation:

density = mass / volume

9.86 g/cm3 = mass / (3 x 10 x 5)

9.86 = mass / 150

9.86 x 150 = 1479 g

1479 / 1000 = 1.479kg