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Problem: A penny is placed a distance r from the center of a record spinning at ω = 90π rad/min. The coefficient of static friction between the penny and the record is μs.= 0.11 on the horizontal plane. Part (a) Select an expression for the maximum distance, r, the penny can be placed from the center and not move.  Part (b) What is the distance, r in meters?

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Part (a)

Equilibrium of forces:

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Problem Details

A penny is placed a distance r from the center of a record spinning at ω = 90π rad/min. The coefficient of static friction between the penny and the record is μs.= 0.11 on the horizontal plane. 

Part (a) Select an expression for the maximum distance, r, the penny can be placed from the center and not move.  


Part (b) What is the distance, r in meters?

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