Kelli weighs 435 n, and she is sitting on a playground swing that hangs 0.36 m above the ground. her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. assume that air resistance is negligible. a) how fast is kelli moving when the swing passes through its lowest position? b) if kelli moves through the lowest point at 2.0 m/s, how much work was done on the swing by friction?

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?