A beam 9m long 40cm wide and 20cm high is made up of iron which has density 50 g per cubic centimetre. then find the mass of the beam in kg.
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Volume of beam =length x width x height
=900 x 40 x 20
=72 x 10^4 cm^3
mass =density x volume
=50 x 72 x 10^4 g
=3600 x 10^4 g
=3.6 x 10^4 kg
=900 x 40 x 20
=72 x 10^4 cm^3
mass =density x volume
=50 x 72 x 10^4 g
=3600 x 10^4 g
=3.6 x 10^4 kg
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