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Q.
A wheel completes $2000$ revolutions to cover the $9.5\,km$ distance, then the diameter of the wheel is _____m
Motion in a Straight Line
Solution:
Distance covered in n revolutions is $n.2\pi r = n .\pi D$
$\Rightarrow $ $2000\pi D =9500$
as n = 2000, distance = 9500 m
so, $D=\frac{9500}{2000 \times \pi}=1.5 m$