Electric toothbrushes can be effective in removing dental plaque. One model cons

Question

Electric toothbrushes can be effective in removing dental plaque. One model consists of a head 1.10 cm in diameter that rotates back and forth through a 70.0 degree angle 7600 times per minute. The rim of the head contains a thin row of bristles. What is the average angular speed in each direction of the rotating head, in rad/s? What is the average linear speed in each direction of the bristles against the teeth? Using your own observations, what is the approximate speed of the bristles against your teeth when you brush by hand with an ordinary toothbrush? (Estimate that the toothbrush turns back and forth through 45

Explanation / Answer

Not sure what the question is ("through a 70.0 angle 7600"??). What are your units? w =310 ? v=1.7 ?

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