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36. (i) A child stands at the centre of turntable with his two arms out stretched. The turntable is set rotating with anangular speed 40 rpm. How much is the angular speed of the child f he folds his hands back and thereby reduces hismoment of inertia to 2/3 times the initial value? Assume that the turntable rotates without friction? [100 rpm)without friction? 100 rpim(ii) Show that the child's new knetc energy of rotation is more than the initial kinetic energy of rotation. How do you[2.5s]account for this increase in kinetic energy? |
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