You are holding a bulletin board weighing w = 4.00 n in place against a wall while your friend secures it to the wall. to keep it from slipping, you apply a force p perpendicular to the bulletin board, pressing it directly into the wall. how large must this force be if the coefficient of static friction with the wall is 0.450?

The two metal spheres in the figure are connected by a metal wire with w switch in the middle. initially the switch is open. sphere 1, with the larger radius, i'd given a positive charge. sphere 2, with the smaller radius, is neutral. then the switch is closed. afterward, sphere 1 has charge q1, is at potential v1 and the electric field strength at its surface is e1. the values for sphere 2 are q2, v2, and e2. a. is v1 < ,> , or = to v2? explain. b. is q2 < , > , or = explain? c. is e1 < ,> ,or = to e2? explain?