Consider a runner in any of the lanes moving at a known, constant tangential speed. Which of the following measuring tools, if any, could be used to experimentally determine the centripetal acceleration of the runner? a. A force probe
b. A protractor protractor
c. A meterstick
d. None of these measuring tools, by themselves, can be used with the known tangential speed to determine the centripetal acceleration of the runner.

6 cos 34, 6 sin 34 trig

its a 5.5 n

glad that

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