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Homework Help: Coefficient of friction question.

  1. Oct 19, 2008 #1
    1. The problem statement, all variables and given/known data

    On a wet racetrack, the maximum safe speed, to avoid sliding on a level circular curve with a radius of curvature of 53 m, is 77 km/hr. What is the coefficient of friction between the car's tires and the track surface?

    2. Relevant equations

    (gravity)*(coefficient) = (v^2)/r

    V= 21.39 m/s (after changing 77 km/hr into m/s)
    Radius= 55 meters

    3. The attempt at a solution

    I kept getting the same answer .8488, but it keeps telling me i'm wrong? Help please!!!
  2. jcsd
  3. Oct 19, 2008 #2
    Cancel that, Stupid me plugged in the wrong radius into the equation, my mistake! Sorry!
  4. Oct 19, 2008 #3


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    Staff Emeritus
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    Gold Member

    There is a discrepancy here.
  5. Oct 19, 2008 #4

    Yep, I just caught this! My mistake. :frown:
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