m/s) 13. A penny is placed 0. 11 meters from the axis of a rotating turntable (record player). When the speed of the record is slowly increased, the coin remains fixed until 36 RPM is reached. At 36 RPM the coin slides off. What is the period of rotation? What was the coefficient of friction between the penny and the record? (1.67 sec/rev; 0.16) 14. A car goes around a curve of radius 122 m at a velocity of 20 m/s. What coefficient of static friction between the tires and the pavement is needed for the car to round the curve without skidding? (0.33)