How far must a circular piston with diameter 4.0 cm be pushed down into one cylinder of a hydraulic lift to raise a circular piston of diameter 12.0 cm by a distance of 36.0 cm

i think it's 35 meters

force tends to be low and long diustance masses are high

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