Physics

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Imagine that you are designing a circular curve in a highway that must have a radius of 330 ft and will carry traffic moving at 60 mi/h.
a) At what angle should the roadbed be banked for maximum safety?
b) If the roadway is not banked, what would the necessary coefficient of static friction between the tires and the asphalt road have to be to keep a car on the road? Is such a coefficient reasonable? (Hint: 1 m=3.3 ft, 1 m/s=2.24 mi/h.)

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