We know that the disk spins at 300 rev/min. One revolution is equal to $2\pi$ radians, so the angular velocity in radians per minute is:
$$\omega_i = 300 \mathrm{~rev/min} \times 2\pi \mathrm{~rad/rev} = 1800\pi \mathrm{~rad/min}$$
To convert to radians per
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