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Question
How many times a wheel of radius 28 cm must rotate to go 352 m? (Take `pi = 22/7`)
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Solution
Radius of wheel (r) = 28 cm
Circumference of wheel = 2πr
= `2 xx 22/7 xx 28` cm
= 176 cm
Distance covered by wheel in 1 revolution = 176 cm
Total distance covered by wheel = 352 m
= 35,200 cm
Total number of rounds = `"Total distance to be covered"/"circumference of wheel"`
= `(352 xx 100)/176`
= `(35200)/176`
= 200
Therefore, it will rotate 200 times.
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