Re: [DIYbio] Re: Physics of recoil

On 03/07/2012 10:07 AM, Phil wrote:
> describe the calculation you did to conclude that 99.5%
> of the energy goes into the bullet.

The balance in a bullet launch is
that both the gun, and the bullet get accelerated the same amount of time.
Simon probably just did a rough guess based on the KE formula and that
it has a V**2 term for each, gun mas is 1000 gram, bullet mass is 25 gram,
and one's V is .1 meters/sec if the gun is
constrained from free moving, and the bullet is maybe 600 m/s, so the ratio
of energies mv**2/2 is 10:9M

Giving it half a percent was conservative and allowing lots of absorbed energy loss.

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