Making the following assumptions: the four charges in the above grid are point charges; each charge has magnitude 1.0 nc (nanocoulombs, and note that two are positive and two are negative); the grid spacing is 1.0 cm; all labeled points lie in the same plane as the charges. determine the magnitude and direction of the electric field at point q.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?