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merlos

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Part A: What is the average angular speed in each direction of the rotating head, in rad/sec?

(140degrees)(pi/180) = 2.44 rad/rev

w = (7600 rev/min)(1min/60sec)(2.44rad/1rev) = 310 rad/sec

Part B What is the average linear speed in each direction of the bristles against the teeth?

A little unsure of

v = rw

v = (.006m)(310rad/sec)

v = 1.85 m/s