Question

a block of iron has dimensions 2m x 0.5m x 0.25m. density of iron is 7.8g cm-3. find the mass of the block

Answer 1

Volume = l × h × w
= 200 × 50 × 25 cm cube
= 250000 cm cube

Mass = Volume × Density
=250000 × 7.8
= 1950000 g = 1950 kg

Answer 2

Answer:

Mass of the cube = 1950kg.

Explanation:

Given:

Dimensions of the cube: 2m x 0.5m x 0.25m

Density = 7.8 g/$cm^{3}$= 7.8 * ($\frac{100*100*100}{1000}$) = 7800 kg/$m^{3}$

Volume of the cube = 2 x 0.5 x 0.25

                                 = 0.25$m^{3}$.

Mass of the cube = volume x density

                             = 0.25 x 7800

                    Mass= 1950kg.