The angular momentum of the propellers of a small airplane points directly forward from the plane. (a) in what direction do the propellers rotate as seen from the rear of the plane? (b) if the plane is flying horizontally and suddenly pulls upward, in which direction does the nose of the plane tend to move? justify your answer. 4mths none

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

answer///terminator or twilight zone;