Question

Highway curves are marked with a suggested speed. If this speed is based on what would be safe in wet weather, estimate the radius of curvaure for a curve marked 50km/h?The coefficient of static friction of rubber on wet concrete is .7, the coefficient of kinetic friction of rubber on wet concrete is .5 .

Answer 1

I think the way to set it up is to compare the maximum friction to the centripetal force.
\[F_f=F_c\]
\[F_f=mgµ_k, F_c = m \frac{v^2}{r}\]
Can use that to solve for r.