Question

a beam 9m long, 50 cm wide, and 20 cm deep is made of wood which weights 30 kg per cubic metre. find the weight of the beam

Answer 1

Length of beam(l)=9 m
Breadth of beam(b)=50 cm
                               =0.5 m
Depth of beam(h)=20 cm
                            =0.2 m
Volume of beam=lbh
                          = 9×0.5×0.2 m³
                          =0.9 m³
Given,
weight per cubic metre=30 Kg
weight for 0.9 m³=0.9×30
                           =27 Kg

Hope it helps u :-)

Answer 2

Answer:

L=9m,B=50 cm = 0.5,D=20cm=0.2

Step-by-step explanation:

volume of the beam= l×b×d= 9×0.5×0.2= 0.9 then weight per m cube is 30 kg and weight for 0.9 is 0.9×30=27