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A wheel completes 2000 revolutions to co...

A wheel completes 2000 revolutions to cover the 9.5 km. distance. then the diameter of the wheel is

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Given, number of revolutions n = 200
Distance `x=9.5 km = 9.5xx10^(3)m=9500 m`
`because` Distance covered in n reveloutions is equal to the circumference of the wheel.
`therefore x=n . 2pi r rArr x=n . pi D` (`because` Diameter `= 2xx` radius)
`9500=2000xxpi xx D`
`rArr` Diameter, `D=(9500)/(2000xx3.14)=1.5m`
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