A bob is whirled in a horizontal plane by means of a string with an initial speed of ω rpm. The tension in the string is T. If speed becomes 2 ω…

A bob is whirled in a horizontal plane by means of a string with an initial speed of $\displaystyle \omega \mathrm{rpm}$. The tension in the string is $\displaystyle T$. If speed becomes $\displaystyle 2 \omega$ while keeping the same radius, the tension in the string becomes :