Hey lads, i solved part a of this problem in 5 minutes, part B is killing me, ive been doing it for 1 hour and nothing.. ive tried everything, any help appreciated:(adsbygoogle = window.adsbygoogle || []).push({});

[Tipler5 5.P.090.] 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 0.05, a car at rest must not slide into the ditch and a car traveling less than 50 km/h must not skid to the outside of the curve. What is the minimum radius of curvature of the curve and at what angle should the road be banked?

____??? m

2.862° (i found this and its correct)

i really dont know if im thinking right anymore after 1 hour of this + other stress that came on so well here is the last thing i tried....

i set my set of axis parallel to the banked road, so the positive Y is the normal force.... and the friction force goes parallel the banked road....

i set the force friction going up the hill to balance the weight component going down the banked road and i had a force component (mv^2/r)/(cos(2.862)

Well i dont even know what im doing anymore.. i know at first i must of been close to solving it but now im too tired to reason ... help appreciated, thanks!

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# Banked Curve (its killing me)

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