A ftat (unbanked) curve on a highway has a radius of 220.0 m. A car rounds the curve at a speed of 25.0 m/s. (a) What is the minimum coefficient of friction that will prevent sliding? (b) Suppose the highway is icy and the coefficient of friction between the tires and pavement is only one-third what you found in part (a). What should be the maximum speed of the car so it can round the curve safely?

Solution 44E Car has acceleration a = v2 and is directed towards centre of arc rad R The static friction force exerted by the roadway is f = sn s a) R= 220 m g= 9.8 m/s 2 v= 25 m/s F yma y n=mg F...