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प्रश्न
The radius of a wheel is 0.25 m. How many revolutions will it make in covering 11 km?
विकल्प
2800
4000
5500
7000
उत्तर
7000
Distance covered in 1 revolution = 2πr
`=(2xx22/7xx0.25)"m"`
`=(2xx22/7xx25/100)"m"`
`= 11/7 "m"`
Number of revolutions taken to cover 11 km`=(11xx1000xx7/11)`
= 7000
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