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If the bottom had tiny holes like the ones on the air hockey games and the floor was smooth, it may slide quite easily just off the floor on the cushion of air.


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Imagine the ballon to stand upright in calm air. Now add a light breeze. Aerodynamic drag will push the ballon sideways. The drag force will act along a line parallel to the wind direction which runs through the center of the ballon and is above the point at which the tether is connected. This force will create a pitching moment and pitch the balloon up. If ...



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