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A small button placed on a horizontal rotating platform
with diameter 0.530 m will revolve with the platform
when it is brought up to a speed of 43.0 rev/min,
provided the button is no more than 0.230 m from the
axis.
What is the coefficient of static friction between the
button and the platform?
How far from the axis can the button be placed, without
slipping, if the platform rotates at 63.0 rev/min ?

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