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Banked Curves and Newton's Laws

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Banked Curve I. A curve with a 120-m radius on a level road is banked at the correct angle for a speed of 20 m/s.

If an automobile rounds this curve at 30 m/s, what is the minimum coefficient of static friction between tires and road needed to prevent skidding?

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This solution discusses banked curves and Newton's laws.

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