A small metal cylinder of mass m = 0.10 kg rests on a circul…

A small metal cylinder of mass m = 0.10 kg rests on a circular turntable, rotating at a constant speed as viewed from above in the diagram below. The coefficient of static friction between the surface and the cylinder is 0.12. If the cylinder is 0.20 m from the center of the turntable, calculate the maximum speed vmax such that the cylinder still moves along its circular path without slipping off the turntable.

Despite a very strong wind, a tennis player manages to hit a…

Despite a very strong wind, a tennis player manages to hit a tennis ball with her racquet so that the ball passes over the net and lands in her opponent’s court. Which forces are acting on the tennis ball after it has left contact with the racket and before it touches the ground?