A probe weighing 64 pounds is dropped into the ocean. Suppose that the water resistance is proportional to v2 v and that the resistance is 512 pounds when the speed is 1 ft/sec. Determine the velocity of this probe at any time t and determine its terminal velocity.

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.