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 ?
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