# Static Friction on a Curve

## Homework Statement

If a curve with a radius of 87.5 m is perfectly banked for a car traveling 71.8 km/hr, what must be the coefficient of static friction for a car not to skid when traveling at 93.8 km/hr?

## Homework Equations

tan $$\theta$$ = $$v^{2}$$ / r*g

## The Attempt at a Solution

I found the banking angle:

tan $$\theta$$ = 19.9^2 / 87.5 * 9.81 = 24.7 deg.

But I'm not sure on how to find what the question is asking for. Help?!