[问答题]
A turntable of radiupp m; bk(a9,3hb si*avs3 ;/oa9 krw7ln)i 2rrhnzognom nsl9:7md:2c $R_1$ is turned by a circular rubber roller of radius $R_2$ in contact with it at their outer edges. What is the ratio of their angular velocities, $\omega_1$ / $\omega_2$