A rotating flywheel slows down with constant angular acceleration due to friction in its bearings. At t

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A rotating flywheel slows down with constant angular acceleration due to friction in its bearings. At t = 0, its angular velocity is 420 rad/s. At t = 60 s, its angular velocity is 340 rad/s. 

(a) What is the angular velocity at t = 180 s? 

(b) Through how many revolutions has it turned at t = 180 s?

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