Phy 213 Quiz 5 Prelim 4 Circular Motion Oct. 23, 2006

1. A 20 kg mass is rotated in a circle by means of a string attached to it and the center of a circle of radius 4 m on a horizontal friction free surface with a speed of 6 m/s. What is the tension in the string ?

2. An automobile rounds a curve of radius 50 m on a flat highway at 100 m/s. What is the coefficient of static friction between the roadway and the tires?
A 3 kg ball is rotated in a vertical circle at the end of a string with a constant 6 revolutions per minute.

3. Find the tension in the string at the top of the circle.

4. Find the tension in the string at the bottom of the circle.

5. Some version of the ever popular ferris wheel problem.