Electric toothbrushes can be effective in removing dental plaque. One model consists of a head 1.10cm in diameter that rotates back and forth through a 70.0 angle 7600times/min . The rim of the head contains a thin row of bristles. its asking me the average angular speed in each direction of the rotating head. w=7600times/min(1min/60s)6.28rad/1rev= 795.49rad/s but it says im wrong what am i doing wrong?