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

[问答题]
A turntable of radiu: l4 cqss ;i2kl0p7svm. z fgzrcx1jk0/rd ;71og+- jxh9bk rvs $R_1$ 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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