Q. Two 4.0 cm x 4.0 cm metal electrodes are spaced 1.5 mm apart and connected by wires to the terminals of a 9.0 V battery. The wires are disconnected, and insulated handles are used to pull the plates apart to a new spacing of 3.0 mm.
What is the charge on each electrode?
Q. A worker on a scaffolding 65 ft above the ground needs to lift a 390 lb bucket of cement from the ground to a point 30 ft above the ground by pulling on a rope weighting 2 lb/ft . Set up the integral of how much work is required (just give the integrand)? Let x denote the height above ground.