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1. Why is an unbalanced force required to produce circular motion?

2. The ratio of squared velocity to radius is a constant. In other words, the centripetal acceleration did not change as the radius changed. Explain.

3. In an amusement park ride called the spinout, riders are positioned against the inside wall of a rotating drum. The drum begins to rotate and after a certain rotational speed is reached, the floor is lowered and the riders remain in position and do not fall. The diameter of the chamber is 4.3 meters and the period of rotation is 1.7 seconds. What is the centripetal acceleration of the rider? Approximately how many

*g's*does the rider experience?

For this one, i got centripetal acceleration to equal 29.4m/s^2. Not sure if its correct but i don't know how to find the second part of the question.