*22. An 830-kg race car
can drive around an unbanked turn at a maximum speed of 58 m/s without
slipping. The turn has a radius of curvature of 160 m. Air flowing over the
car’s wing exerts a downward-pointing force (called the downforce) of
11 000 N on the car. (a) What is the coefficient of static friction
between the track and the car’s tires? (b) What would be the maximum
speed if no downforce acted on the car?
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