A body vibrates 100 times in 20 seconds. Find its frequency and time period. a) f = 0.2 Hz T = 5sec

(b) f = 5sec T = 0.2 Hz

(c) f = 20 Hz T = 5 sec

(d) f = 5 Hz T = 0.2sec

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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.