A 40-volt electromotive force is applied to an lr-series circuit in which the inductance is 0. 1 henry and the resistance is 90 ohms. Find the current i(t) if i(0) = 0. I(t) =.

c.the charges if the proton and electron and gravity

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

there are no contact forces mentioned on the list of choices that you've provided.