Question 1 A car is moving at 9 m/s along a curve on a horizontal plane with radius of curvature 46 m. The acceleration of gravity is 9.8 . What is the required minimum coefficient of static friction between the road and the car's tires to keep the car from skidding? Question 2 A space station in the form of a large wheel, 139 m in diameter, rotates to provide an "ar- tificial gravity" of 4.1 m/s2 for people located on the outer rim. Find the rotational frequency of the wheel that will produce this effect. Answer in units of rpm.