Two metal disks, one with radius ?1 = 2.50 cm and mass ?1 =0.800 kg and the other with radius ?2 = 5.00 cm and mass ?2 = 1.60kg are welded together and mounted on a frictionless axis throughtheir common center as shown to the right. a) A light string iswrapped around the edge of the smaller disk and a 1.50 kg block issuspended from the free end of the string. How far will the masshave to descend to give the system of disks 21.0 J of rotationalkinetic energy? b) How many revolutions has the system of disksmade after the mass has descended a distance of 4.00 m?
