Consider a 2000 liters large tank holding 1000 liters of pure water into which a brine water solution of salt begins to áow at a constant rate of 6 liters/min. the solution inside the tank is kept well stirred and is áowing out of the tank at a rate of 6 liters/min. if the concentration of salt in the brine entering the tank is 0: 1 kg/liter. (i) set up the initial value problem equation and solve the problem. (ii) determine when the concentration of salt in the tank will reach 0: 05 kg/liter.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

the answer is a. hope this .

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