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Extracted text: A small button placed on a horizontal rotating platform with diameter 0.320Om will revolve with the platform when the platform is brought up to a speed of 40.0rev/min, provided the button is no more than 0.150m from the axis. Determine what is the coefficient of static friction between the button and the rotating platform. O 0.117 O 0.269 O 0.243 0.188