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A hoop of mass M and radius R, initially at rest, falls onto a disk of...

A hoop of mass M and radius R, initially at rest, falls onto a disk of the same mass and radius but an initial angular speed of ω1. There’s friction between the hoop and disk, but there’s no net external torque on the system consisting of the hoop and disk. ().

a. For this process, the kinetic energy of the system consisting of the hoop and disk is conserved. True/False?

b.For this process, the angular momentum of the system consisting of the hoop and disk is conserved. True/False?

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