A three-phase load consumes 200kVA at 0.8 pf lagging. The line-to-line voltage magnitude at the load is 2000V. The three-phase distribution line supplying this load has an impedance of .
Compute the line-to-line voltage magnitude at the sending end of the distribution line, the real and reactive power supplied at the sending end of the distribution line.

measuring things 1 litre of water

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