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Hot air balloon

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chumura10
 
Reply Thu 1 Dec, 2005 12:19 pm
A hot air balloon stays aloft because

a) hot air is more dense than cold air
b) the buoyant force F is less than the weight of the balloon and its load
c) the burners provide thrust to offset gravity
d) hot air is less dense than cold air

I am leaning toward answer d.
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engineer
 
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Reply Thu 1 Dec, 2005 01:49 pm
Good, because if a or b were true (they aren't), the balloon would stay on the ground. C doesn't work since the thrusters up on the balloon and down on the basket by equal amounts.
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