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Question

Course Contents » W6 » Coin on Turntable Notes mark Evalate Communicate PtIfo » H (c5p24) A coin placed on a turntable rotating at 32.9 rev/min will stay there if its center is placed no further than 9.1 cm from the axis of rotation. What is the maximum distance the center of the coin can be placed from the axis if the turntable rotates at 45.2 rev/min? 4.82x10-2 m You are correct Your receipt no. is 155-9903 Previous Tries What is the coefficient of friction between the coin and turntable? Submit Answer Incorrect. Tries 4/12 Previous Tries

Explanation / Answer

here,

w1 = 32.9 rev/min = 3.44 rad/s

r1 = 9.1 cm = 0.091 m

let the coefficient of friction between the turntable and coin be us

equating the forces horizontally

uk * m * g = m * w1^2 * r1

uk * 9.81 = 3.44^2 * 0.091

solving for uk

uk = 0.11

the coefficient of friction between the turntable and coin is 0.11

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