Re: physicist call
Rdouglass, thanks for the info, there's some really interesting stories on that Potato Cannon link you gave us! I had no idea that you could build potato guns that powerful. These guns are indeed not toys, they are pretty dangerous! It's amazing that you could give a potato so much speed that it pierces 1/2" plywood! Some people were firing all sorts of other projectiles like limes, cans of beer, jelly beans, dead rats, dynamite sticks, Barbie dolls, light bulbs, D cell batteries, etc. It does sound like a risky hobby, though.
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