AP Physics 1
2.9 Circular Motion
A car is safely negotiating an unbanked circular turn at a speed of \(21\,\text{m/s}\). The road is dry, and the maximum static frictional force acts on the tires. Suddenly a wet patch in the road decreases the maximum static frictional force to one-third its dry road value. If the car is to continue safely around the curve, to what speed must the driver slow the car?
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