Discussion Forum

A beam 9m long, 40 cm wide and 20 cm deepis made up of iron whihc weights 50 kg per cubic metre.FInd the weight of the beam?

Answer:

Explanation:

Volume of the beam=lbh $=9\times \frac{40}{100}\times \frac{20}{100}$$= \frac{72}{100}m^{3}$

The weight of the iron beam is given as  $1 m^{3} = 50 kg$

$\therefore \frac{72}{100}m^{3}$$=\frac{72}{100}m^{3}$ $=\frac{72}{100}\times 50=36 kg$