Physics - Rotation Question with Solution | TestHub

A block of mass$0.1 \mathrm{kg}$is attached to a cord passing through a hole in a horizontal frictionless horizontal surface as shown in the figure. The block is originally revolving at a distance of$0.4 \mathrm{m}$from the hole, with an angular velocity of$2 \mathrm{rad} {\mathrm{s}}^{-1}$. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to$0.2 \mathrm{m}$. Considering the block to be point mass, calculate the new angular velocity (in$\mathrm{rad} {\mathrm{s}}^{-1}$).