At 12:26 PM +0200 8/17/01, Jez.Cunningham@xxxxxxxxxx wrote:
Sorry folks, but in an idle moment during lunchtime I had to scratch
around in the back of my brain for my school math formulae to
compare this steel dart and the sparrow. I kept to "imperial" units
of measure...
My results are that dropping the 2lb steel dart from 8-10 feet gives
a terminal velocity (after 0.75 seconds) at the helmet of about 24
ft/sec. That's a kinetic energy of 0.5*mass*velocity-squared = 576
(what are the units?)
For the sparrow, say 1 ounce, at terminal velocity of 110mph
(terminal for the sparrow!) the energy comes out at 5162 energy
units!
ALMOST TEN TIMES WORSE THAN THE LAB TEST!
Sounds to me like you were lucky! (Not so lucky for the sparrow)
best regds
Jez-the-ex-mathematician
I think this ain't right. I get about 161 fps, which squares to
26,028, divide by 32 for the difference in mass and you get about
814 energy units. If it had been a grackle, though...
paul the ex-physicist
--
Paul Wallich pw@xxxxxxxxx
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