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If diameter of a road roller is 0.9 m and its length is 1.4 m, how much area of a field will be pressed in its 500 rotations ? |
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Answer» Length of the road roller, h = 1.4 m Radius of the road roller, r = 0.92/2 = 0.45 m Now, Area of the field pressed in one rotation = Curved surface area of the road roller = 2πrh = 2 x 22/7 x 0.45 x 1.4 = 3.96 m2 ∴ Area of the field pressed in 500 rotations = 500 × Area of the field pressed in one rotation = 500 × 3.96 = 1980 m2 Thus, the area of the field pressed in 500 rotations is 1980 m2. |
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