speed

ok, say you have a rifle set up at point A. it's aimed at point B, a bulleye target 100 yards away. now you have a sheet of 1/8" steel that you can place at any point between A and B to slow down the bullet (let's assume that the trajectory of the bullet won't change after it strikes the sheet...

I know that the Andromada galaxy is 26 million light years away from here, but if that's so, and that galaxy is moving because of it's gravitational attraction towards us shouldn't it have already reached us in the past or am I confused becuase light travels faster then gravity. Brian Greene...

Has anyone heard of Evelyn Woods speed reading techniques? Are they woo-woo or does it work? Any studies that prove or disprove it, no studies at all? US site here Aussie site here Edited to add Straight Dope Says it's a scam. And gave a book to look up, which my brother is doing right...

Does the speed of sound lower when temperature rises or drops? -INRM

This is something I've been wondering but have been afraid to ask (I just thought I should KNOW this). Someone asked me this and I couldn't answer it entirely. There is a minimum velocity to escape the Earth's atmosphere. Is there also a minimum re-entry speed? I was asked why the shuttle has...

say the sun popped out of existence. we wouldnt know for around 7 minutes because of it's distance and how long the sun's light takes to reach us. ok, simple enough. but if the sun popped out of existence would it's gravity exerted on us (and every other object in our solar system) cease...