2.How much iron is needed to make a rod of length 90 cm and diametar 1 – InterviewSolution

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2.How much iron is needed to make a rod of length 90 cm and diametar 1.4 Cm

Answer»

Here , diameter,d= 1.4 cmradius of rod,r=d/2=0.7 cm

length of rod, h= 90 cm

Amount of iron needed is equal to the volume of the rod.

Amount of iron needed= πr²h=22*0.7²*90/7=> Amount of iron needed= 138.6 cm³

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