09.42: A uniform, solid disk with mass M and radius R is rotating on a fixed, f
e9w;r c;a;phi)v9 uvarictionless platform with constant angular speed ω0 about a fixed axis through its center. A second uniform solid disk of mass
;vaih c)v9;; ap9erwu 2M and radius R/2 is placed from rest directly on top of the first disk so that the centers of the disks line up. When equilibrium is established, the disks are spinning at the same rate. What is the angular speed of the disks at equilibrium?