A diver has a historic SRMV of 0.8 cfm during the ascent phase of a dive. The diver wishes to make a dive to 130 fsw. After ascent, the diver wants to reach the safety stop at 10 fsw with 800 psig remaining in the diver's AL80. With what cylinder pressure should the diver leave the bottom?

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

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y