Q4 of 23 Page 1

Solve sub-questions:

A roller of diameter 0.9 m and the length 1.8 m is used to press the ground. Find the area of the ground pressed by it in 500 revolutions.

Diameter =0.9 m ∴r=0.45 m

Height =1.8 m


Number of rotations = 500


Area of the ground pressed by the roller in one rotation = curved surface area of the roller.


= 2


=


=5.0868 m2


∴ Area of the ground pressed by the roller in 500 rotations.


= 2


= 2543.4 m2


∴ Area of the ground pressed by the roller is 2543.4 m2


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