6. A 1200 kg car rounds a curve of radius 66 m banked at an angle of 14°. What is the magnitude of the friction force required for the car to travel at 82 km/h?

If the curve on the road has a bank angle of 18 degrees and the radius of curvature is 225m. a) what is the maximum speed you can go if the coefficient of friction between the tires and the road is 0.3? Your car is 1500kg. b)What is the minimum speed you can go without sliding?

5. A rock of mass 3.0 x10² g is tied to one end of a string that is 2.0 m in length. Holding the other end above his head, a boy swings the rock around in a circle whose plane is parallel to the ground. (a) If the string can withstand a maximum tension of 4.5 N before breaking, what angle to the vertical does the string reach just before breaking? Draw the FBD for the rock. State the balanced and unbalanced forces directions. (b) At what speed is the rock travelling just as the string breaks? 2.0 m 0 R

Problem 1. What is the maximum speed with which a 2,000-kg car can round a turn of radius 75.0 m on a flat (horizontal) road if the coefficient of static friction between the tires and the road is 0.600? What angle should the turn be banked to keep the car on the bank at this speed if the coefficient of static friction is changed to 0 (an iey curve)?