Asked by krals

A banked circular highway curve is designed for traffic moving at 57 km/h. The radius of the curve is 216 m. Traffic is moving along the highway at 42 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to take the turn without sliding off the road? (Assume the cars do not have negative lift.)
Answered by Ms. Sue
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Answered by Chanz
Fn sinθ = mv^2/r
Fn cosθ = mg
so tanθ = v^2/rg
Now you have θ go back and add friction to your FBD. Find mu required for extra friction not handled by the normal force