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The Joule and the Impact of the hit with heavier BBs

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Old July 12th, 2007, 00:18   #46
Flatlander
 
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5) I would say so. What else could cause hurt? When something has momentum, it also has energy. The transfer of energy to the tissue of the body would cause pain. Why can't momentum do this alone? Think electricity. Electircity doesn't have momentum (don't give me any quantum electron movement theories, because the momentum of an electron is rediculously small, since it has such a tiny tiny tiny tiny mass and they don't even move that fast either...not as fast as most people might think anyways). For all intents and purposes electricity is just energy. Pure energy. Yet when you're connected to a live wire or two, it can really hurt. Now, I'm not entirely sure on what I just said, since the closest thing to an electricity course I've taken is a first year intro to electricity and magnetism and a really simple electricity and thermophysics course, but it seems to make sense to me.
I'm not sure electricity is "pure" energy as it is just the flow of electrons which causes different effects such as creating magnetic fields. I don't even know what "pure" energy is or if it exists?

Anyways, doesn't it hurt because you get burned? Either by the extremely hot arc and/or the electrons flowing through your body encountering resistance?

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6)But then collision thoery has to be accounted for. The thawed chicken is a softer medium so it will absorb some of the impact energy (which would probably cause it to explode into little bits). The frozen chicken is a harder medium so it will not absorb nearly as much of the impact energy, which will force it all onto the object it is impacting. This is definately a very bad analogy for our BB case, since the BBs are of nearly the same hardness, and would produce the same type of impact.
That's what I was saying (or so I thought it was)...

Anyways, I know that impact energy is quite frequently used to determine the "damage" created by impacts but I don't know how that results into pain. Got to break some stuff in my Strength of Materials course and calculated "impact energy" (look up charpy test).

Easy way to find out, someone take hits point blank with various size BB's and tell me what hurts more...have fun.

Barf: I need actual measured FPS's from a chrony from the same AEG, not just theoretical data/calculations.
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Old July 12th, 2007, 00:28   #47
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I'm not sure electricity is "pure" energy as it is just the flow of electrons which causes different effects such as creating magnetic fields. I don't even know what "pure" energy is or if it exists?

Anyways, doesn't it hurt because you get burned? Either by the extremely hot arc and/or the electrons flowing through your body encountering resistance?
You're probably right. Like I said, I don't much much on the topic of e- movement. Only need to know that for infrastructure design (well, I suppose grid design).

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That's what I was saying (or so I thought it was)...
Yeah. Glad we are on the same page there.

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Anyways, I know that impact energy is quite frequently used to determine the "damage" created by impacts but I don't know how that results into pain. Got to break some stuff in my Strength of Materials course and calculated "impact energy" (look up charpy test).
I'm familliar with it. Well think of it as an impact transfers energy from the projectile to the nerves in your body. It can't really transfer the momentum (too much momentum wwould mean piercing and then a direct transfer of energy, rather than transfering through the skin and any gear/cloths).
I think it's safe to say that both momentum and energy can be attributed to pain, but moreso energy than momentum.

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Easy way to find out, someone take hits point blank with various size BB's and tell me what hurts more...have fun.
Hmmm. I like it, pain in the name of science (which isn't exactly a new thing).
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