Q. A stone of mass 1 kg tied to the end of a string of length 1 m, is whirled in a horizontal circle with a uniform angular velocity 2 ${rads}^{- 1}$. The tension of the string is (in newton)

A) $2$
B) $\frac{1}{3}$
C) $4$
D) $\frac{1}{4}$
Explanation

(c) The tension of the string,
$T = mr\omega^{2}$
$= 1 \times 1 \times {(2)}^{2} = 4N$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.