A flat (unbanked) curve on a highway has a radius of 220 m. A car rounds the curve at a speed of 38.0 m/s. (a) What is the minimum coefficient of

A flat (unbanked) curve on a highway has a radius of 220 m. A car rounds the curve at a speed of 38.0 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 find in part (a). What should be the maximum speed of the car so it can round the curve safely?