the force exerted by a driving boat is conservative, provide the internal function is negligible. Assume friction is negligible. Describe the changes in the potential energy of driving boat as a swimmer dives from it, starting just before the swimmer steps on the boat until just after his feet leave it.

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.