Question

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

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

Answer 1

Answer: (A)

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