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Comment Re:XOR is useless (Score 1) 277

I used to do this to generate admin passwords for PAP2 devices going out in the field ;-)

device MAC address: 7eec2ada9f0b
device admin password: 0e8620ffe985

echo 7eec2ada9f0b | md5sum | md5sum | md5sum | cut -c -13
0e8620ffe985

Damn, I should have XORed it with a secret password on top of that then my scheme would have been really bullet proof...

Comment Re: Just what the Moon always wanted (Score 1) 97

Ok I will give you an hint:

It would make the solar system a {0} body system with a very hard center of mass to compute.
The {0} parameter would depend on which planets we exclude from our Earthly definition I guess, think about Pluto ;-)

In the end yes, the whole thing rotates around the center of mass which we haven't clearly identified yet...

Comment Re: Just what the Moon always wanted (Score 1) 97

In order to account for binary systems, I like to generalize and say it's all the same although the formula to compute the actual center of mass when inside the larger body differs than when it is outside. This is because when inside the larger body, some part of the larger body modify the gravitational attraction from the smaller body.

But in the end, the important point to be aware of is the center of mass.

http://slashdot.org/comments.p...

As a side note. although there is few references to such cases, it is the same for 3,4,5... body systems. All you have to understand is the center of mass.

Translated to slashdot developer like language: Understand the basic principles and avoid re-inventing the wheel as much as possible.

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Thus spake the master programmer: "After three days without programming, life becomes meaningless." -- Geoffrey James, "The Tao of Programming"

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