A playground ride consists of a disk of mass M = 47 kg and radius R = 2.3 m mounted on a low-friction axle. A child of mass m = 29 kg runs at speed v = 2.7 m/s on a line tangential to the disk and jumps onto the outer edge of the disk..If the disk was initially at rest, now how fast is it rotating? That is, what is its angular speed? (The moment of inertia of a uniform disk is ½MR2.)

Question

anonymous · Answer

Child's angular momentum, M R v, will be shared between child and disk after she gets on it.