gc textbook chapter 8 Rotational Motion (id: 5f9e3d4a0)

[问答题]
A turntable of radiuelq jfn)z( uo8x.:lb 3sy15ik ae9(iy q. rwr l .cqnk8xm/br72 $R_1$ 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, $\omega_1$ / $\omega_2$

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