- #1
Sabrina2372
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Homework Statement
A civil engineer is asked to design a curved
section of roadway that meets the following
conditions:
With ice on the road, when the coefficient of
static friction between the road and rubber is 0.12, a car at rest must not slide into the ditch
and a car traveling less than 70 km/h must not skid to the outside of the curve.
What is the minimum radius of curvature of the curve? Answer in units of m[/B]
Homework Equations
∑F=mv^2/r
The Attempt at a Solution
FnsinΘ+ FfcosΘ= mv^2 /r
Then I went to the y direction to find Fn and got
Fn=(mg+FfsinΘ/cosΘ)
When I tried to get Ff out of the equation, I ended up subbing it for (μFnsinΘ/cosΘ)
But then I still have Fn in the equation!
This is really confusing me and the homework is due tonight so please help![/B]