A rocket of initial mass 135 kg (including all the contents) has an engine that produces a constant vertical force (the thrust) of 1720 N . Inside this rocket, a 17.0-N electrical power supply rests on the floor.
a) Find the acceleration of the rocket?
b) When it has reached an altitude of 120 m, how hard does the floor push on the power supply? (draw a free body diagram of the power supply)

an electric circuit

a 2,000 calorie based diet.

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