An aluminum coin of mass 10g is placed on a horizontalturn-table, 20cm from the

Question

An aluminum coin of mass 10g is placed on a horizontalturn-table, 20cm from the axis of rotation of the table. Thecoefficient of static friction between aluminum and table is0.30. What is the maximum linear speed the coin can be rotatedwithout it drifting from its original position? An aluminum coin of mass 10g is placed on a horizontalturn-table, 20cm from the axis of rotation of the table. Thecoefficient of static friction between aluminum and table is0.30. What is the maximum linear speed the coin can be rotatedwithout it drifting from its original position?

Explanation / Answer

The idea is that the maximum static frictionforce,   umg ,   will be used to keep the coinin circular motion. So... .         u m g = m v2 / r     solve for v .     v = ugr = 0.3*9.80*0.20   =    0.767 m/s   is the max linear speed

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