Q. A stone of mass $16\ kg$ is attached to a string $144\ m$ long and is whirled in a horizontal circle. The maximum tension the string can withstand is $16\ Newton.$ The maximum velocity of revolution that can be given to the stone without breaking it, will be
A) $20\ ms^{- 1}$
B) $16\ ms^{- 1}$
C) $14\ ms^{- 1}$
D) $12\ ms^{- 1}$
Explanation
(d) Maximum tension $= \frac{mv^{2}}{r} = 16N$
$\Rightarrow \frac{16 \times v^{2}}{144} = 16 \Rightarrow v = 12\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.