A ball is tied to one end of a string. The other end of the string is

Question:

A ball is tied to one end of a string. The other end of the string is held fixed. The ball is set moving around a vertical circle without friction, and with speed at the top of the circle, as in Figure P8.70. At what angle θ should the string be cut so that the ball will then travel through the center of the circle?

A ball is tied to one end of a string. The other end of the