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04-05-2008, 06:23 PM
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| Help with physics question??
Electric toothbrushes can be effective in removing dental plaque. One model consists of a head 1.10 in diameter that rotates back and forth through a 70.0 angle 7600 . 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 ? w =310 What is the average linear speed in each direction of the bristles against the teeth? v =1.7 ? Using your own observations, what is the approximate speed of the bristles against your teeth when you brush by hand with an ordinary toothbrush? v =? cm/s http://answerboard.cramster.com/physics-topic-5-229881-0.aspx      |
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