Q. A ball of mass $0.25\ kg$ attached to the end of string of length $1.96\ m\ $moving in a horizontal circle. The string will break if the tension is more than $25\ N.\ $What is the maximum speed with which the ball can be moved
A) $14\ m/s$
B) $3\ m/s$
C) $3.92\ m/s$
D) $5\ m/s$
Explanation
(a) $T = \frac{mv^{2}}{r} \Rightarrow 25 = \frac{0.25 \times v^{2}}{\ 1.96} \Rightarrow v = 14\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.