Coefficient of friction question.

[JohnnyB212]

Homework Statement

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?

Homework Equations

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

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

The Attempt at a Solution

I kept getting the same answer .8488, but it keeps telling me I'm wrong? Help please!

 

[JohnnyB212]

Cancel that, Stupid me plugged in the wrong radius into the equation, my mistake! Sorry!

 

[cepheid]

...on a level circular curve with a radius of curvature of 53 m

Radius= 55 meters

There is a discrepancy here.

 

[JohnnyB212]

There is a discrepancy here.

Yep, I just caught this! My mistake.