We know that one revolution is equal to $2\pi$ radians and one minute is equal to $60$ seconds. So, we have:
\[
\omega = 13 \, \text{rev/min} \times \frac{2\pi \, \text{rad}}{\text{rev}} \times \frac{1 \, \text{min}}{60 \, \text{s}} = 1.36 \, \text{rad/s}
\]
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