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Physics, 10.08.2021 20:20 bloodgif3386

A small button placed on a horizontal rotating platform with diameter 0.324 mm will revolve with the platform when it is brought up to a rotational speed of 45.0 rev/minrev/min , provided the button is no more than 0.140 mm from the axis. Reqiured:
a. What is the coefficient of static friction between the button and the platform?
b. How far from the axis can the button be placed, without slipping, if the platform rotates at 60.0rev/m ?

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