Whirl a conker around in a horizontal circle on a piece of string.
What is the smallest angular speed with which it can whirl?
A think about the physics of a motorbike riding upside down
Look at the Doppler effect during a rollercoaster ride
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.