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The electric potential difference across the cell membrane of a human cell is 0.080 V, with the higher potential being outside the cell. In one cellular process a sodium ion Na+, with charge +e, is pumped through a channel in the membrane to be ejected from the cell.
(a) How much work must be done by the cell to eject the ion?
(b) A candy bar contains 270 Calories, or 1.13*10^6 J of food energy. How many sodium ions could the cells of your body eject using the energy obtained in one candy bar?
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A train is travelling up a 5.0 degree incline at a speed of 2.25m/s when the last car breaks free and begins to coast without friction. a) How long does it take for last car to come to rest momentarily? b) How far did the last car travel before mo..
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A person fishing from a pier observes that five wave crests pass by in 7.4 s and estimates the distance between two successive crests to be 4.3 m. The timing starts with the first crest and ends with the fifth. What is the speed of the wave? m/s
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