Q. In a bicycle the radius of rear wheel is twice the radius of front wheel. If $r_{F}$ and $r_{r}$ are the radius, $v_{F}$ and $v_{r}$, are speeds of top most points of wheel, then
A) $v_{r} = 2\ v_{F}$
B) $v_{F} = 2\ v_{r}$
C) $v_{F} = v_{r}$
D) $v_{F} > v_{r}$
Explanation
(c) The velocity of the top point of the wheel is twice that of centre of mass and the speed of centre of mass is same for both the wheels (Angular speeds are different)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.