February 23, 2017

Homework Help: Physics

Posted by Rita on Wednesday, April 28, 2010 at 5:14pm.

A platform rotates at an angular speed of 2.2 rad/s.  A block rests on the platform a distance of 0.3m from the axis.  Static friction coeffient= 0.5.  Without any external torque acting on the system, the block is moved towards the axis.  Ignore the moment of interia of the platform.  Determine the smallest distance in cm from the axis the block can be moved and still remain in place as the platform rotates. 
I know that the answer is between 17 and 23cm.

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