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zerogoal

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## Homework Statement

A curve with a 135 m radius on a level road is banked at the correct angle for a speed of 20m/s.

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

## Homework Equations

N=mg(cos\theta)

mgsin(\theta)=centripetal force=mv^2/r

Quite confused with the workings for this question, anyone can help?