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A penny of mass 3.1 g rests on a small 24 g
block supported by a spinning disk of radius
21 cm. The coefficients of friction between
block and disk are 0.751 (static) and 0.64
(kinetic) while those for the penny and block
are 0.616 (static) and 0.45 (kinetic).
Disk
Penny
Block
What is the maximum speed of the disk
without the block and penny sliding? The
acceleration of gravity is 9.8 m/s.

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