Question

) A child stands at the centre of a turn table with his
two arms out stretched. The turn table is set rotating
with an angular speed of 40 rpm. How much is the
angular speed of the child change if he folds his hands
back and thereby reduces his moment of inertia
to
2/3
times the initial value? Assume that the turntable rotates
without friction.
(ii) Show that the child's new kinetic energy of rotation is
more than the initial kinetic energy of rotation.















don't a swer my question
only @knightg will do​

Answer 1

(a) A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to 2/5 times the initial value? Assume that the turntable rotates without friction. (b) Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?

please mark as brainliest answer