75*40
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12.7 kg / m
MS Channel Weight: 100mm(length)*50mm(width)*5mm(thick)*.000785=19.625 Kg
answer is 14.3 Kg.
100mmx50mmx5mmx0.000785x100m=1962kg
divide the beam into three rectangles, calculate the area of each rectangle and multiply it by length. then you get the volume of beam & finally multiply it by density