7. A 1800 kg car rounds a curve of radius 74.0 m banked at an angle of 13.0. What is the magnitude of the friction force required for the car to travel at 82.0 km/h? N 8. A coin is placed 16.5 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 44.0 rpm is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable