Question

a beam 9 m long, 40 cm wide and 20 cm high is made up of iron which has density 50 g per cubic centimeter. then find the mass of the beam in kg

Answer 1

As the Beam Dimensions are : Length - Width - Height

We can Conclude that the Beam is in the Shape of a Cuboid

We know that :

$\heartsuit$  Volume of a Cuboid is given by : Length × Width × Height

⇒ Volume of Beam : (900 × 40 × 20) = 720000 cm³

Given : 1 cm³ of Beam weighs 50 grams

⇒ 720000 cm³ of Beam weighs : (50 × 720000) = 36000000 grams

We know that : 1 kg = 1000 grams

⇒ The Beam Weighs : 36000 kg