Determine the height which should second ball be placed
Two ping-pong balls each have a mass of 2.7g and carry a net charge of 0.430μC. One ball is held fixed. At what height should the second ball be placed directly above the fixed ball if it is to remain at rest there?
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When the key is in the "up" position, the plate separation is 0.74mm. How far must the key be depressed for a keystroke to be registered which happens when the capacitance increases by 3.9 pF?
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How far downstream is the swimmer carried in 1.5 min. and what is his velocity relative to an observer on shore?
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