[问答题]
A nonrotating cylindri(-u:rp fqdnsywz9 0t.cal disk of moment of inertia I is0asz8;ki6+2su y) l pfh-ktqxy1x9 m k dropped onto an identical disk r 8 6mlzy1s;-sp+)ikf9 ytx2a k uqh0xkotating at angular speed $\omega$ Assuming no external torques, what is the final common angular speed of the two disks?