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A hot air balloon achieves itsbuoyant lift by heating the air inside the balloon, which makes itless dense than the air outside.

Suppose thevolume of a balloon is 1800m3 and the requiredlift is 2700N. Calculate the temperature of the air inside the balloon which will produce the required lift. Assume thatthe outside air temperature is 0*C and that air is an ideal gasunder these conditions. What factors limit the maximum altitude attainable by this method for a given load?

(Neglect variables like wind.)

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