Astraight, cylindrical wire lying along the x axis has a length l and a diameter d. it is made of a material described by ohm's law with a resistivity rho. assume potential v is maintained at the left end of the wire at x = 0. also assume the potential is zero at x = l. in terms of l, d, v, rho, and physical constants, derive expressions for the following. (use the following as necessary: l, d, v, rho, and π.)
(a) the electric field in the wire.
(b) the resistance of the wire.
(c) the electric current in the wire.
(d) the current density in the wire.
(e) show that e = rho. j

a. are

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

the components of a vector are the parts of the vectors that are to each other.

b perpendicular