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A small button placed on a horizontal rotating platform with diameter 0.326m will revolve with the platform when it is brought up to a rotational speed of 43.0rev/min , provided the button is a distance no more than 0.145m from the axis.
Part A: What is the coefficient of static friction between the button and the platform?
Part B: How far from the axis can the button be placed, without slipping, if the platform rotates at 55.0re.
An asteroid is discovered heading straight toward Earth at 14 km/s . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10minutes , after which the asteroid is moving at 28degrees to its original pa..
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