A spot of paint on a bicycle tire moves in a circular path of radius 0.33 m.

When the spot has traveled a linear distance of 1.76m , through what angle has the tire rotated?

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.