- #1
Balsam
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- 8
Homework Statement
A car is making a turn on a wet highway ramp. The coefficient of static friction between the tires and the road is 0.25. Determine the maximum speed at which the car can safely negotiate a turn of radius 200m with a banking angle of 20 degrees.
radius= 200m
μs=0.25
angle(θ)=20°
Homework Equations
Fs=μs(Fn)
Fc=mv/r
The Attempt at a Solution
I tried solving this by drawing an FBD. I drew my x and y axes so they could follow the incline and the normal and friction forces would run along the axes. The only force I broke down into components was Fg. I used the first formula to solve for Fs by plugging in the given coefficient of static friction and plugging in +mgcosθ for Fn. I got Fs=0.25(mucosθ). Then, I plugged that into the second formula with all other given values. I divided out my 'm' variables, and then isolated for 'v'. The answer I got was 22.14609185m/s. The correct answer is 36m/s. I don't know what I did wrong.