Aman pushes a lawn mower on a level lawn with a force of 250n. if 40% of this force is directed downward, how much work is done in joules by the man in pushing the mower 6.2 m?

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.