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Originally posted by Redwing
61221.6 J
or 61.2216 kJ
or 14621.83 calories
dT = Q / cp is the only formula you need
How about this one:
A hot air ballon has a volume of 2500 cubic meters and a takeoff weight (mass) of 250 kg. Outside temperature is 15 degrees C.
At what inside temperature will it take off?
Assume air is an ideal gas with a volume of 22,4 liters per mole and consists of 20% oxygen (O2) and 80% nitrogen (N2).
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Don't know the answer off hand, and far too lazy to dig out some books, but a quick look at 'How stuff works...Hot air balloons"...I did discover this line....
"But nothing really got off the ground until the summer of 1783, when the Montgolfier brothers sent a sheep, a duck and a chicken on an eight-minute flight over France."
...I'll be dammned if there ain't a joke in there somewhere...lol.
Maybe,:
the duck went " quack , quack", the chicken went "cluck, cluck" and the sheep went, "that'll be ten bucks Dale".
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