A race car rounds one end of a speedway. This end of the track is a turn with a radius r of approximately 187 ft. If the track is assumed to be completely flat and the race car is traveling at a constant 60.00 mi/h around the turn, what is the race car's centripetal (radial) acceleration a c ? a c = 41.41 ft / s 2 Convert this result to SI units. a c = 12.621768 m / s 2 What is the force responsible for the centripetal acceleration in this case? gravity weight friction normal To keep from skidding into the wall on the outside of the turn, what is the minimum coefficient of static friction μ s between the race car's tires and the track?