Posted by admin on Tuesday, March 10, 2009 · Leave a Comment
off the cuff I'd say at least and 100 kiloton. Has anyone stopped to figure it out? And after watching it over again I think it amasing they stood as long as they did after getting hit. Does anyone else agree with me?
according to news the planes weighed 100 tons and they were traveling at 543 Kmh
The question was on the force of impact, not the energy released from the burning fuel. The maximum takeoff weight of a 747-300 is 374,850 kg. Assuming a speed of 550 mph, or about 245 m/s, and using the formula e = (1/2)mv^2, we can obtain an energy of 1.1325 x 10^10 joules. One ton of TNT is 4,184 x 10^9 joules. Thus the maximum "yield" of a 747 is about 2.7 tons (not kilotons) of TNT.
If you look at the fuel, a 747-300 can carry 54,750 gallons. Estimating at 8 lbs to the gallon, that means that it carries 219 tons of fuel. Is 219 tons of jet fuel equal to a hundred kilotons of TNT? Nope. One pound of jet fuel has 18,600 BTUs of energy, so the entire fuel load has the energy of 8.1 x 10^9 BTUs. One ton of TNT has the energy of 3.9 x 10^6 BTUs. So, if all the fuel could be exploded at once, it would equal about 2 kilotons of TNT. Note, however, that jet fuel doesn't explode.
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