Adentist's drill starts from rest. after 3.00 s of constant angular acceleration it turns at a rate of 2.90 ✕ 10^4 rev/min. (a) find the drill's angular acceleration. (b) determine the angle (in radians) through which the drill rotates during this period.

Initial angular velocity wi = 0

final angular velocity wf = 2.9 x 10⁴ rev/min

wf = 2.9 x 10⁴ (2*3.14 rad)/(60 sec)

wf = 3.035 x 10³ rad/sec

time t  = 3 sec

angular acceleration α

wf = wi + αt

3.035 x 10³ = 0 + α(3)

α = 1012 rad/s²

(b) angle covered is θ

θ = wi*t + (1/2)αt²

θ = 0*3  + (1/2)(1012)(3²)

θ = 4554 rad

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