> Well, no.
> In the case of a 2.25 kg pound rifle firing a 9.7 gram bullet, less than
> half a
> percent of the energy goes into the rifle, and more than 99.5% goes into the
> bullet.
You seem to be saying that the fraction of energy going into the
bullet is equal to the fraction of total mass made up by the rifle.
This makes no sense to me.
An explosion between the bullet and the rifle should transfer about as
much energy into the bullet as into the rifle.
A person in body armor can be shot with a shotgun at close range and
not knocked down; and the kick from firing a shotgun is enough to
knock someone down who isn't braced for it; so the magnitude of these
forces must be similar.
>Let's say it came to rest in a single second, so the speed is 0.1 meters
per second.
No, a second is a very long time for these things. I would be
surprised if the speed was less than 10 meters per second. If you
knew the coefficient of friction you could compute the minimum force
needed to make the thing start moving and the speed at which it would
move.
Put it this way: If you fired your 420j .38 into an armoured BSC, I'd
be very very surprised if it moved at all. So it does not make sense
to say it moved 10cm after absorbing 3 joules.
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