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Comment: Re:Intriguing, but landing at launch site? (Score 3, Informative) 53

by Hiroto. S (#49038709) Attached to: SpaceX Signs Lease Agreement With Air Force For Landing Pad

fly all the way back to the launch site (would seem to be alot of fuel) -

That was my original impression, that you have to continuously burning to actively control the fall. But I recently saw a number that Apollo style capsul's terminal velocity is something around 300 miles/h and they spend several minutes free falling after fireball decelleration. Note "free falling" in this context is different from physical definition of free falling and describe the falling at constant speed of terminal velocity. 300 miles/h is half as fast as horizontal speed of airliners, and comparing to 120 miles/h of skydiving of human body (I'm a skydiver), it is not very fast. So after the supersonic reentry, I assume first stage is already on the trajectory to free fall toward the landing pad only controlled by the fins without any fuel burn. I'm curious what is the terminal velocity of the falcon 9 first stage is, but with empty large volume with little fuel left, and engine cones facing down, I imagine it is not that fast. This phase of landing is abbreviated in their fancy CG, so I too also got impression that they burn fuel from pretty high up, but we also saw one chase plane video of first stage coming down through the clouds without burning any fuel and seems to be in stable free falling.

Programming

Introducing Children to Computers? 886

Posted by Cliff
from the next-generation-of-IT-workers dept.
Years ago, kids could be gradually introduced to computers through learning languages like LOGO and educational computer games. Many of us started our computing careers at our parent's workplace, logged in to a word processor to type away, only to become fascinated with the whole computing thing. So Slashdot, let's hear how you were lured into the digital life. What was it that drew you to a life of programming? How old were you when you first used a computer? What pieces of modern software do you think would be a good way to introduce today's kids to the world of computing?

"An entire fraternity of strapping Wall-Street-bound youth. Hell - this is going to be a blood bath!" -- Post Bros. Comics

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