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Centripetal Force (RPM Question!)

  • Thread starter McKeavey
  • Start date
  • #1
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Homework Statement


A coin is placed 18cm from the axis of a rotating turntable of variable speeds. If the coefficient of friction is 0.68, what is the maximum r.p.m that the coin can handle before sliding off?


Homework Equations


This is basically what I need..
I know there's mv^2/r
But which equation do I need for RPM questions?


The Attempt at a Solution


None at the moment, not sure of the equation I'm supposed to use :S
 

Answers and Replies

  • #2
PeterO
Homework Helper
2,425
46

Homework Statement


A coin is placed 18cm from the axis of a rotating turntable of variable speeds. If the coefficient of friction is 0.68, what is the maximum r.p.m that the coin can handle before sliding off?


Homework Equations


This is basically what I need..
I know there's mv^2/r
But which equation do I need for RPM questions?


The Attempt at a Solution


None at the moment, not sure of the equation I'm supposed to use :S
As well as mv2/r there is 4∏2rm/T2 where T = period

Since frequency is 1/T that would mean 4∏2rmf2

frequency means revolutions per second. r.p.m is revolutions per minute.
 

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