Damon and Elena arrange a series of weights as shown in the drawing. The masses on the right are m1 = 30kg and m2 = 50kg. The beam itself weighs 175g. If in the beginning, the system is motionless, find the mass necessary to make this happen, i.e. (a) Find m3. Now suddenly Stefan gets jealous and goes after the setup, cutting both of the wires holding m2 and m3! (b) Find the angular acceleration of m3 after the wires holding m2 and m1 are cut.