Question

A wheel covers a distance of 9.5 km in 2000 revolutions. The diameter of the wheel is

• A. 15 m
• B. 7.5 m
• C. 1.5 m
• D. 7.5 m

Answer 1

Answer: (C)

1.5 m

Answer 2

Distance $= n(2\pi r)$ ⇒ $9.5 \times 10^{3} = 2000 \times (\pi D)$

⇒ $D = \frac{9.5 \times 10^{3}}{2000 \times \pi} = 1.5m.$