Calculate the period of a ball tied to a string of length 0.504 m making 3.9 revolutions every second. answer in units of s. your answer must be within ± 2.0% 004 (part 2 of 2) 10.0 points calculate the speed of the ball. answer in units of m/s. your answer must be within ± 2.0%

12.35022 m/s

Explanation:

f = Frequency = 3.9 rev/s

r =  Length of string = 0.504 m

Time period is given by

The time period is 0.25641 s

The speed is given by

The speed of the ball is 12.35022 m/s

v=ir = 3x15 =45 v

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me