A 0.50 kg ball that is tied to the end of a 1.1 m light cord is revolved in a horizontal plane with the cord making a 30° angle, with the vertical.
(a) Determine the ball's speed.
(b) If, instead, the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make with the vertical?
(c) If the cord can withstand a maximum tension of 10.0 N, what is the highest speed at which the ball can move?
PS: I already know how to solve a. so please help in part b and c and yes i already looked at textbook help and the way to get those answers are wrong so please help! Thanks =)