It looks like the previous answer already provided the angular speed in radians per minute, which is $2640.000$ rad/min.

Here's the detailed process for clarity:

Calculation Recap

1. Speed Conversion: The car's speed is converted from miles per hour to inches per minute. $\text{Speed} = 55 \, \text{mph} = \frac{55 \times 63360}{60} = 58080 \, \text{inches per minute}$

2. Wheel Circumference: The wheel's diameter is 44 inches, so its circumference is: $C = \pi \times 44 = 138.230 \, \text{inches}$

3. Rotations per Minute: $N = \frac{58080}{138.230} = 420 \, \text{rotations per minute}$

4. Angular Speed: $\omega = 420 \times 2\pi = 2640.000 \, \text{rad/min}$

Would you like further explanation on any part of this calculation?