Giant Swing

A giant swing is an artistic gymnastics element in which a gymnast rotates around an axis while in a fully extented position.

1) What is the minimum angular speed of the gymnast to make such a swing?

2) Find the force required by the arms to keep spinning.

3) Suppose that a gymnast makes one spin per second. Calculate his angular speed and the force on the arms at the bottom and the top positions.

State any assumptions that you make.

The picture is taken from http://www.sciencephoto.com/media/320527/view.