On 2008-03-29, Dan wrote:
The fact is that the impact of a 9mm bullet --at muzzle velocity -- is
equal to a *one pound* weight dropped from a height of 5.96 feet
(achieving a velocity of 19.6 fps) or a ten pound weight dropped from
a height of 0.72 inches (yes, that's 3/4 of an inch!)

What size of 1lb weight?

It depends on the density of that 1 lb weight. If that weight was
one micron cubed, it would probably go all the way to the centre of
the earth. But 1lb of duck feathers wouldn't even hurt you at that
velocity.

A 1lb weight travelling at 19.6 fps, or in proper units, a 0.455
kilogram weight travelling at 6 metres per second has twenty times the
kinetic energy of a .45 round (around 8 kilojoules, versus the .45's
kinetic energy of about 0.5 kilojoules).

--
From the sunny Isle of Man.
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