Practice - Practice a) When the heat is on and the balloon...

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Practice a) When the heat is on and the balloon is floating, how do the number of air molecules inside the balloon compare to the number of air molecules that would be occupying that volume if the balloon wasn’t there? If these are different, why doesn’t the balloon grow or shrink until they are the same? The number of air molecules in the balloon is less than the number in an equivalent volume outside the balloon. The balloon is not sealed, so the pressure inside and outside are always the same. The hot air inside is at the same pressure as the surrounding atmosphere even though the density is lower because the molecules are moving at a higher average speed, so each molecule undergoes more collisions and exerts a greater force with each collision. b) Assume we have a hot air balloon with the same volume as the balloons in problem 4. i) What is the buoyancy force upwards due to the air surrounding the balloon? (Hint: look at what you did in problem 5). The buoyancy force is F_buoy = volume x (density of air
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This note was uploaded on 04/11/2011 for the course PHYS PHYS1010 taught by Professor Ee during the Spring '09 term at Colorado College.

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Practice - Practice a) When the heat is on and the balloon...

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