How do i find 25? *picture included* plz answerrr

What is the length x of the side of the triangle below? (hint: use the cosine function)

What is the major limitation to the light microscope?

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.