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?

What is the mass of the same rock on the earth

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

What quantity do units represent in value