balloon potential and kinetic energy

Feb 3rd, 2012
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The document explain the problem: When a helium balloon rises it gains KE and gravitational PE. Where does that energy come from? Assume that the density of the balloon is d1 and that of the air is d2, calculate the rising speed of the balloon when it at the height h.

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When a helium balloon rises it gains KE and gravitational PE. Where does that energy come from? Assume that the density of the balloon is d1 and that of the air is d2, calculate the rising speed of the balloon when it at the height h . As the helium balloon rising, the air from above fills up

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