A coin placed on a turntable rotating at 36.2 rev/min will stay there if its cen

Question

A coin placed on a turntable rotating at 36.2   rev/min will stay there if its center is placed no further than 9.9 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 46.9   rev/min?

What is the coefficient of friction between the coin and turntable?

A highway curve with a radius of 700 m is banked properly for a car traveling 140  km/h. If a 1620-  kg Porshe 928S rounds the curve at 250  km/h, how much sideways force must the tires exert against the road if the car does not skid?

Explanation / Answer

(a) For stable coin on turntable

[Fcentripetal = Ffriction]

ie requisite centripetal force to be in a given circle must be provided by the static friction force >

for just staying on table >

Fcentripetal = Ffriction

mv2/r =

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