Q. A uniform metal chain is placed on a rough table such that one end of it hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is
A) 3/4
B) 1/4
C) 2/3
D) 1/2
Explanation
(d) $Coefficent\ of\ friction\ \mu = \frac{F}{R}$
$= \frac{mg/3}{2mg/3} = \frac{1}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.