What happens when you shoot an arrow in space?

[Armchair Rocket Scientist]

[quote name='wumpus']Just how many pound draw do you need to fire an arrow at orbital velocity? You aren't going to hit the Earth from ISS with any bow pulled by mortal man (ignoring slow, slow air resistance).[/QUOTE]

No amount of draw. As you make the bow larger, it gets heavier, and the body and string of the bow have significant inertia. Ultimately, for a given bow design the speed will be limited by material strength and density. Maybe with some extremely complex design you could get an arrow to go supersonic, but orbital velocity is comparable to the detonation speed of high explosives. I'm not sure how you'd get any material to elastically rebound at those speeds.