4. a spherical shell with outer radius b surrounds a charge-free cavity of radius a < b. if the shell contains a charge density given by   0 3 2 c/m for 0 elsewhere v v arb r r           a. find the electric field e in all regions b. determine the electric potential v in all regions c. determine the electrostatic energy stored for r  a, a  r  b, and r  b.

Alivestock company reports that the mean weight of a group of young steers is 1100 pounds with a standard deviation of 93 pounds. based on the model n(1100,93) for the weights of steers, what percent of steers weigh a) over 1050 pounds? b) under 1300 pounds? c) between 1150 and 1250 pounds?

The total amount of energy contained in an object

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.