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Message |
Forum: Computers, Math, Science, and Technology Topic: Kepler's 2nd |
| jonk |
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Posted: 26 Feb 2008, 2:30 pm
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Replies: 7
Views: 2,095
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| Now, if you think about the above a little, and in particular consider the case where the force/acceleration due to gravity is zero and a particle simply follows a line at a constant velocity, and if you also embrace the idea that the area swept per unit time is constant even under central accelerat... |
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Forum: Computers, Math, Science, and Technology Topic: Your curent computer specs! |
| jonk |
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Posted: 26 Feb 2008, 2:04 pm
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Replies: 223
Views: 31,565
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| I have something similarly slow and the only thing, which slows it down to a crawl is Lyx - but then, it maybe was a bad idea to put a modern word processor (or document processor, for the nitpickers among you ;) ) on it in the first place. Microsoft's Word 5.5 was the last one designed for DOS. It... |
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Forum: Computers, Math, Science, and Technology Topic: Kepler's 2nd |
| jonk |
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Posted: 26 Feb 2008, 6:37 am
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Replies: 7
Views: 2,095
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| Okay. So here is a slight modification of the orbit. Again, the ellipse isn't necessary. It could be a corkscrew, for all I care. It's just there because it sometimes helps to think that way, but it isn't crucial. http://www.infinitefactors.org/math/kepler2/orbitswept.gif In this, I've allowed the p... |
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Forum: Computers, Math, Science, and Technology Topic: Kepler's 2nd |
| jonk |
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Posted: 26 Feb 2008, 3:53 am
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Replies: 7
Views: 2,095
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| I'm with you, I just ducked out of sight for a day or two to work on some assignments. So, the "infinitesimal analysis" point of view isn't necessarily one that's widely seen. Personally, I would have just made everything a function of an arbitrary parameter t (or if time will be used later for som... |
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Forum: Computers, Math, Science, and Technology Topic: Kepler's 2nd |
| jonk |
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Posted: 25 Feb 2008, 9:19 pm
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Replies: 7
Views: 2,095
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| I hope I'm not losing lau and wolphin on this. This is what I meant when I talked about the use of infinitesimals in a context that is just slightly different that the usual exposition found and I thought I'd just jump in and see how it goes. I guess I could say things a little differently about cal... |
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Forum: Computers, Math, Science, and Technology Topic: Kepler's 2nd |
| jonk |
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Posted: 25 Feb 2008, 6:00 pm
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Replies: 7
Views: 2,095
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| Okay. I guess I'll take it slower. Let's just make sure that the first derivative steps are laid out and understood. If we can agree that far, I'll go through the 2nd derivative in painstaking detail to show how I arrived at the result. One thing to keep in mind that I'm not taking the derivative wi... |
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Forum: Computers, Math, Science, and Technology Topic: Your curent computer specs! |
| jonk |
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Posted: 25 Feb 2008, 4:23 pm
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Replies: 223
Views: 31,565
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| Sounds really neat! Having ISA slots is really nice. The machine really isn't all that slow, either. I do a lot of work on the machine and it always works well and quickly. It's in the case of modern 3D games, I suppose, that it would perform poorly or not at all. The video board is ancient and the... |
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Forum: General Autism Discussion Topic: Not getting jokes |
| jonk |
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Posted: 25 Feb 2008, 10:45 am
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Replies: 31
Views: 11,222
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| i have read in several places that autistic people often do not realise people are joking & take what people say literally. this is true for me in some cases, but i have also noticed that on the occasion that i understand that someone is joking, i often find it difficult to communicate the fact... |
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Forum: Love and Dating Topic: Date gift |
| jonk |
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Posted: 25 Feb 2008, 10:41 am
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Replies: 45
Views: 4,116
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zee wrote: Try and make a good impression with yourself alone.
That seems wise.
Jon |
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Forum: News and Current Events Topic: Amorous dolphin targeting swimmers |
| jonk |
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Posted: 25 Feb 2008, 10:39 am
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Replies: 7
Views: 1,702
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| It's an old story. Lots of male dolphins have behaved that way and been reported from time to time in the news. I think the first time I heard about such things was more then 35 years ago, and it was ancient history then. In fact, the article mentions the "Flipper" TV show. I remember reading they h... |
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Forum: Love and Dating Topic: Date gift |
| jonk |
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Posted: 25 Feb 2008, 10:27 am
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Replies: 45
Views: 4,116
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| Something that represents you is another option. What is it that is a piece of who you are? It might be a book I really enjoyed and is about a subject I care a lot about, for example, if there is also a chance she might also enjoy it. Or something I built, but isn't too much work. If I were into pot... |
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Forum: Computers, Math, Science, and Technology Topic: Global environment science -- learn or debate? |
| jonk |
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Posted: 25 Feb 2008, 10:13 am
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Replies: 17
Views: 2,452
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| Evolution works quite rapidly, I disagree. Mutations can happen quite rapidly but evolution takes more than one generation. Well, that is a strawman as that wasn't what I was saying. It would obviously take a number of generations, but that would be the context under consideration. I'll await your ... |
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Forum: Computers, Math, Science, and Technology Topic: Kepler's 2nd |
| jonk |
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Posted: 25 Feb 2008, 12:39 am
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Replies: 7
Views: 2,095
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| I thought I'd start here and suggest these things about Euclidean geometries (and in local regions of manifolds where such geometries roughly hold): ⋅ The specific area swept per unit time, in the presence of centrally directed forces, is a function of initial conditions and it doesn't mat... |
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Forum: Computers, Math, Science, and Technology Topic: Global environment science -- learn or debate? |
| jonk |
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Posted: 24 Feb 2008, 4:50 am
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Replies: 17
Views: 2,452
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| The only way we can preserve and nurture other and more precious freedoms is by relinquishing the freedom to breed..." Educated women are less likely to have large families. Educating women throughout the world has (and can still have) a large effect on the population crisis. This point you make is... |
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Forum: Computers, Math, Science, and Technology Topic: Global environment science -- learn or debate? |
| jonk |
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Posted: 24 Feb 2008, 4:08 am
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Replies: 17
Views: 2,452
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Othila, if you get a chance, see about fixing up the quoting a bit. I think, at the end, that you have my words placed as your voice, in fact. And nothing after that, which makes me curious if you had written and lost something there.
Jon |
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Forum: Computers, Math, Science, and Technology Topic: math equations? |
| jonk |
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Posted: 24 Feb 2008, 12:07 am
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Replies: 23
Views: 3,343
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| Okay. Now I'm having fun. http://www.infinitefactors.org/math/tests/fun1.png which is done with: \end{equation*} \newcommand{\dudu}{du} \begin{eqnarray} y(t) & = & \left\{ \begin{array}{ll} \int_{-\infty}^... |
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