Q. A string breaks if its tension exceeds $10\ newtons$. A stone of mass $250\ gm$ tied to this string of length $10\ cm$ is rotated in a horizontal circle. The maximum angular velocity of rotation can be
A) $20\ rad/s$
B) $40\ rad/s$
C) $100\ rad/s$
D) $200\ rad/s$
Explanation
(a) $T = m\omega^{2}r \Rightarrow 10 = 0.25 \times \omega^{2} \times 0.1 \Rightarrow \omega = 20\ rad/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.