User Panel
User Panel
User Panel
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Posted: 4/6/2006 12:16:27 PM EDT
[#1]
87%
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Posted: 4/6/2006 12:18:24 PM EDT
[#2]
IIRC about 30%
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Posted: 4/6/2006 12:18:30 PM EDT
[#3]
30%
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Posted: 4/6/2006 12:19:25 PM EDT
[#4]
w00t 6 seconds
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Posted: 4/6/2006 12:20:43 PM EDT
[#5]
jerk |
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Posted: 4/6/2006 12:21:29 PM EDT
[#6]
DING-DING-DING!! That's close enough. 29% is the correct answer. NEXT QUESTION (FILL IN THE BLANK) : A pound of single-base rifle powder has an energy content of about _____________ FT LBS of energy. |
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Posted: 4/6/2006 12:21:37 PM EDT
[#7]
sorry, I thought it was funny, it was a friendly w00t
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Posted: 4/6/2006 12:23:23 PM EDT
[#8]
no prob, I was just guessing, 30% is usually the answer to energy efficiency type questions |
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Posted: 4/6/2006 12:24:13 PM EDT
[#9]
Kind of like picking C on a multiple choice question
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Posted: 4/6/2006 12:24:24 PM EDT
[#10]
First find the energy of the bullet. E=1/2MV^2
Second, find the energy stored in the powder and primer based on its mass and stored chemical energy More data about muzzle velocity, powder type, ect is necessary to get a numerical result. Now, just set up a ratio of E(bullet)/E(propellent). |
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Posted: 4/6/2006 12:24:35 PM EDT
[#11]
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Posted: 4/6/2006 12:27:39 PM EDT
[#12]
I assume this is calculated by knowing the heats of formation of the reactants and products, assuming total powder combustion, calculating the theoretical maximum energy, and dividing that number by the kinetic energy of the bullet?
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Posted: 4/6/2006 1:28:42 PM EDT
[#13]
18% Foot pounds a pound.
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