The radius of the wheel of a car is 98 cm. Find the number of revolutions it completes, when it travels a distance of 3.850 m.

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Solution

C = 2πr

= 2 × × 98

= 2 × 22 × 14

= 616 cm

Distance Travelled = 3850 m = 385000 cm

∴ Number of revolutions = = = 625

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