Homework Help: physics

Posted by matt on Sunday, October 9, 2011 at 9:37pm.

A compact disc spins at 2.8 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.1 cm from the CD's center.
(a) What is the coefficient of friction between the ant and the CD?

I dont understand how to solve

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