Question

A roller 2 m long and .7 m in diameter makes 60 revolutions in a minute in a road how much area is rolled by it

Answer 1

roller is in the form of cylinder so,
h=2m,r=d/2=0.7/2=0.35m
one revolution gives one CSA of cylinder,so for 60 revolutions=60×2Πrh=60×2Π×0.35×2=263.76sq.m