Q. 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
Explanation
(a) Distance covered in n revoulation=n2$\pi r = n\pi D$
$\Longrightarrow 2000\pi D = 9500$
$\Longrightarrow D = \frac{9500}{2000 \times \pi} = 1.5m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.