[问答题]
A nonrotating cylindrical disk of m pp rd(,fa7jsw )*lhi;c(bek4oment of 7j i:nva,w.y5 r6qz a )l1nwdzinertia I is dropped onto an identical disk rotating at angular speev dwz1qrz lwij :y5. n7a,)an6d $\omega$ Assuming no external torques, what is the final common angular speed of the two disks?