A coin is placed 15.0 cm fromthe axis of a rotating turntable of variable speed.
ID: 1742811 • Letter: A
Question
A coin is placed 15.0 cm fromthe axis of a rotating turntable of variable speed. When the speedof the turntable is slowly increased, the coin remains fixed on theturntable until a rate of 34 rpmis reached, at which point the coin slides off. What is thecoefficient of static friction between the coin and theturntable?I get .19 = mew of friction forthe answer but the webassign says it's wrong. What formuladid other peeps use? I get .19 = mew of friction forthe answer but the webassign says it's wrong. What formuladid other peeps use?
Explanation / Answer
Given that the distance between the coin and the axis of rotationis d = 15.0 cm = 0.15 m The angular velocity is = 34 rpm = ( 34*2 / 60)rad/s = 3.55 rad/s ------------------------------------------------------------------------------------------------------- If the coin moveson the table without the sliding on the rough horizontalplane mg >= mr2 g >= r2 >= r2 / g >=---------- g >= r2 >= r2 / g >=----------Related Questions
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