Question

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

• A. 1.5 m
• B. 1.5 cm
• C. 7.5 cm
• D. 7.5 m

Answer 1

The correct option is A

1.5 m

Distance covered in 'n' revolution=$n2\pi r=n\pi D$
$\Rightarrow 2000\pi D=9500[Asn=2000,distance=9500m]$
$\Rightarrow D=\frac{9500}{2000\times \pi }=1.5m$