We know that 1 revolution is equal to $2\pi$ radians, and 1 minute is equal to 60 seconds. So, we can convert 1500 r/min to rad/s as follows:
$1500 \frac{\text{rev}}{\text{min}} \times \frac{2\pi \text{ rad}}{\text{rev}} \times \frac{1 \text{ min}}{60 \text{ s}}
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