Question

A road roller of 3.2 m long and 1.4 m in radius when rolled on a road was found to cover 19712 sq.M. How many revolutions does it make

Answer 1

Step-by-step explanation:

Given, length of a cylindrical roller , h= 2.5

Radius of a cylindrical roller = 5500m2

∴ Area rolled to cover in one revolution = Curved surface area of a cylindrical roller

=2πrh=2×227×1.75×2.5

=44×4.3757=192.57=27.5m2

∴ Number of revolutins rolled by a cylindrical

=Total area rolled by a cylindrica rollerArea rolled to cover by a cylindrical roller in one revolution=550027.5=200

Hence, the number of revolutions rolled by a cylindrical roller on a road is 200.

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