It is required to design a zener shunt regulator to provide a regulated voltage of about 10 v. the available 10-v, 1-w zener of type 1n4740 is specified to have a 10-v drop at a test current of 25 ma. at this current, its r z is 7 . the raw supply, v s , available has a nominal value of 20 v but can vary by as much as ±25%. the regulator is required to supply a load current of 0 ma to 20 ma. design for a minimum zener current of 5 ma.

unbalanced force

explanation:

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