Q 11-04-006NEETNEET 2024Top questionEasy
A bob is whirled in a horizontal plane by means of a string with an initial speed of $\omega$ rpm. The tension in the string is $T$. If speed becomes $2\omega$ while keeping the same radius, the tension in the string becomes :
Answer: (D) $4T$
Concept. Tension provides the centripetal force: $T = m\omega^2r$.
Step 1. Scale. Same $r$, double $\omega$: $T' = 4T$.
Answer. $4T$ (Option D).
Solution by Sreeraj P, M.Sc Physics