The displacement vector from your house to the library is 520 m long, pointing 40 ∘ north of east. what are the x-component (x-axis is directed from west to east) of this displacement vector? what are the y-component (y-axis is directed from south to north) of this displacement vector?

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.