A tetherball set has a ball with mass 0.411 kg and a nylon string with diameter 2.50 mm, Young's modulus 4.00 GPa, and density 1150 kg/m³. The nylon string has a length of 2.200 m when the ball is at rest (hanging straight down). While playing tetherball, Monty hits the ball around the pole so it moves in a horizontal circle with the string at an angle of 65.0° to the pole. 

(a) How much does the string stretch compared with when the ball is at rest?

(b) What is the ball's kinetic energy? 

(c) How long would it take a transverse wave pulse to travel the length of the string from the ball to the top of the pole?

Transcribed Image Text:

65.0