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प्रश्न
The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?
उत्तर
Radius of the wheel = 42 cm
Circumference of the wheel = 2πr
`= 2 xx 22/7xx420`
= 264 cm
`=264/100 "m" `
= 2.64 m
Distance covered by the wheel in 1 revolution = 2.64 m
Total distance = 19.8 km or 19800 m
∴ Number of revolutions taken by the wheel `=19800/2.64 = 7500`
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