The inner cylinder of a long, cylindrical capacitor has radius ra and linear charge density of +λ. It is surrounded by a coaxial cylindrical conducting shell with inner radius rb and linear charge density −λ. A) What is the electric field? (Hint: use Gauss's law)
B) What is the energy density in the region between the conductors at a distance r from the axis?
C) Integrate the energy density calculated in part B) over the volume between the conductors in a length L of the capacitor to obtain the total electric-field per unit length.

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".