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Since the curve is designed for a speed of 85 km/h, traveling at that speed would mean no friction is needed to round the curve. From Example 5-15 in the textbook, the no-friction banking angle is given by
Driving at a higher speed with the same radius means that more
Equate the two expressions for the normal force, and solve for the speed.
(III) A curve of radius 68 m is banked for a design speed of 85 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve? [Hint: Consider the direction of the
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