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Comment: Re:Iron Man's Suit Defies Physics -- Mostly (Score 2, Interesting) 279

by John Carmack (#23266718) Attached to: The Science of Iron Man
Hydrogen peroxide powered rocket packs fly for around 30 seconds, because they have a specific impulse of around 125, meaning that one pound of propellant can make 125 pound-seconds of thrust, meaning that it takes about two pounds of propellant for every second you are in the air. Mass ratios are low for anything strapped to a human, so the exponential nature of the rocket equation can be safely ignored.

A pretty hot (both literally and figuratively) bipropellant rocket could manage about twice the specific impulse, and you could carry somewhat heavier tanks, but two minutes of flight on a rocket pack is probably about the upper limit with conventional propellants.

However, an actual jet pack that used atmospheric oxygen could have an Isp ten times higher, allowing theoretical flights of fifteen minutes or so. Here, it really is a matter of technical development, since jet engines have thrust to weight ratios too low to make it practical. There is movement on this technical front, but it will still take a while.

John Carmack

Comment: Not addressing the root cause (Score 0) 857

by Enrique G (#17847638) Attached to: 10 Years of Pushing For Linux — and Giving Up
I think the problem here is the person writing this article does not address the root cause of their problem. I'm sure he'd have the same amount of trouble (err, more) trying to connect a Lotus Notes client to the Exchange server. The problem is not Linux being ready, its trying to get incompatible peices of software to work together. If Microsoft released the protocol documentation for speaking to Exchange and Evolution officially supported all features, then his complaint may stand. If a company used a colaboration suite that was built for Linux, it could do everything he needed.

Comment: Re:If that's your approach... (Score 1) 512

by ThaFooz (#14509088) Attached to: Computer Science Students Outsource Homework
I know computer people have always looked down on business, but the truth is a good business/economics program is no easier than computer science

Well, I was going for the funny mod more than anything. I don't honestly believe buisness programs (the word encompasses so much, I was really refering to Marketing/HR/Sales/Managment) are inherently 'easier' than technical work, after all its a sound buisness model & management that make or break the buisness. But I do believe that the decision making process and/or the results of said decisions in the buisness world are often subjective (after all, how do you can you quantify people skills?), thus making it harder to identify the talented from the not-so-talented when compared to the technical side.

A method of solution is perfect if we can forsee from the start, and even prove, that following that method we shall attain our aim. -- Leibnitz

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