The design I am building is like the simple DC motor design on http://www.coolmagnetman.com/magdcmot.htm
I need some help in understanding how the shape of the loop of current carrying wire (like the difference between a square and circle shape) figures into determining the rpm on a simple dc...
How would you calculate the height needed to do a flip off the wall as described in http://www.wikihow.com/Run-up-a-Wall-and-Flip given the height of the person and the speed.
In the case of table tennis, would you be able to use calculus to find the angle needed to return a ping pong ball with a certain spin. So if a ping pong ball is hit at you with a top spin, what minimum or maximum angle do you need to return it.