Question

A wheel completes $2000$ revolutions to cover the $9.5\,km$ distance, then the diameter of the wheel is

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

Answer 1

Answer: (B)

1.5 m

Answer 2

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, $D=\frac{9500}{2000 \times \pi}=1.5 m$