Aconducting spherical shell with inner radius ‘a’ and outer radius ‘b’ has a positive charge q located at its center. the total charge on the shell is -4q, and it is insulated from its surroundings.

(a) derive expressions for the electric field magnitude in terms of the distance ‘r’ from the center for the regions: r , a; a < r < b; r > b.
(b) what is the surface charge density on the inner surface of the conducting shell?
(c) what is the surface charge density on the outer surface of the conducting shell?
(d) draw a sketch showing electric field lines and the location of all charges.
(e) draw a sketch of the electric field e as a function of

The chemical effect of the endocrine system is longer lasting than the chemical effect of the nervous system. select the best answer from the choices provided t f

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e