Question

The drill used by most dentists today is powered by a small air-turbine that can operate at angular speeds of 350000 rpm. These drills, along with ultrasonic dental drills, are the fastest turbines in the world-far exceeding the angular speeds of jet engines. Suppose a drill starts at rest and comes up to operating speed in 2.0 s . You may want to review (Pages 305 - 307) .

Part A

Find the angular acceleration produced by the drill, assuming it to be constant.

Express your answer using two significant figures.

? =

rev/s2

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Part B

How many revolutions does the drill bit make as it comes up to speed?

Express your answer using two significant figures.

?? =

rev

Answer 1