A pail of water is rotated in a vertical circle of radius 1. (a) What two external forces act on the water in the pail.

A pail of water is rotated in a vertical circle of radius 1.00 m. (a) What two external forces act on the water in the pail. (b) Which of the two external forces is most important in causing the water to move in a circle. (c) What is the pail's minimum speed at the top of the circle if no water is to spill out? (d) If the pail with the speed found in part (c) were to suddenly disappear at the top of the circle, describe the subsequent motion of the water. Would it differ from the motion of a projectile?