Math CentralQuandaries & Queries


Question from abdulai, a student:

a circular saw with diameter 18.4cm rotates at 2400rpm. What is the angular speed of a point on the edge of the saw blade in radians per second?


If the saw rotates 2400 revolutions per minute that's 2400/60 = 40 revolutions per second. Each revolution is 2 π radians so the angular speed is 2 × π × 40 radians per second.


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