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What is the average angular acceleration of the bit of a dentist's drill? What is the linear speed of the cutting edge?

A) A dentist's drill turns a 0.75 mm diameter bit at 5.0 x 10^5 rev/min. What is the linear speed of the cutting edge? B) When the drill is first turned on it takes about ¼ of a second to come up to full speed. What is the average angular acceleration of the bit?

I believe the answer is A) 20 m/s and B) 2.1 x 10^5 rad/s^2. I need to see each step and formula to solve this question.

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