|  lorenlai | Jun 19, 2007 7:27am | I am teacher of math and ,actually I am writing books that help me to share my teachings: math + art + Science and history
It is a way to demystify those subjects
I would like to present to you the series of books entitled, "Caius Zip - The Time Traveller,"
The main idea behind the "CAIUS ZIP - The Time Traveller" series is to show the history made by great men and how mathematics and other subjects were important in their decisions. Caius Zip is a young man that participates in these discoveries and in the great battles. In each adventure, he acquires maturity and learns that to get out of trouble he must use his most important ability that he unknowingly uses very well: the power of deduction
The first book, " Einstein, Picasso, Agatha and Chaplin:, How to explain the theory of relativity, cubism, travelling in time and unmask a murderer " has been published
See a passage from the book in: caiuszip.com/relativiting.htm [caiuszip.com/relativiting.htm] |
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Sponsor |  ntltrmllgnc | Jun 23, 2007 12:24pm | I would suggest dropping the names of the discoverers from the name of this or that law. As a student I did well on concepts in both History and Science but I couldn't remember which of Newton's Laws were 1 2 and 3 or which Louis the 13th, 14th, 15th did what.
Why call it "Bernoulli's Principle" when "The Velocity-Pressure Principle" is a far better title?
Also try the shameless-self-promotion.group.stumbleupon.com.
I like the style by the way. I just have one issue. It is gravity which curves the bed. The watermelon wants to go to the Earth. So does the lemon. The only reason it looks like the melon attracts the lemon is because the lemon wants to go to the Earth and the bed won't let it. It's a bit like describing electromagnetism to be like a rubber band when in fact it is em-ism that makes the rubber band stretch and snap back. |
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|  Beastrider20 | Jul 12, 2007 7:02am | | I have no issue really with the watermelon and the lemon, just don't forget that it is all based on the weight of the mass not the size. Example: black holes start with super imploded star smaller than the lemon but would curve the bed in so far that you would not even see the water melon anymore. |
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|  ajinx999 | Aug 20, 2007 4:59am | The passage is nice.
It's not attraction (unlike Newton's Gravitation), that compels Earth to move in an elliptical orbit (along the curve).
Consider the motion of a body in 2-dimensions. The shortest possible translational path between 2 points covered by the body in the plane will be a "straight line".
Same is the situation in 3-dimensional space. The translational motion of the Earth makes it to move in the shortest possible path. In the curvature of space-time, the shortest path is not a straight line in our general sense (or else Earth would have gone through the Sun) but a curve. This path is actually a straight linear path along the curve. This path is called "geodesic".
So, what I meant to say is that Gravitation causes the curvature, and the bodies move along it in such a way that they cover the shortest possible path (in consistent with their translational motion). This kind of configuration gives a blind feeling that the bodies are attracting each other. |
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Sponsor | | ntltrmllgnc | Sep 1, 2007 12:09pm | This is silly. It's not the electrons repelling each other either it's the photon emission. C'mon.
Space cannot be one way for one set of objects and another way for another set and it can't change instantly as one set passes by after another. A line can't be curved in two different directions. It would be two curves. |
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| | ajinx999 | Sep 2, 2007 8:25am | | Will you be more elaborate, ntltrmllgnc? I didn't understand your statement. |
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Sponsor | | ntltrmllgnc | Sep 9, 2007 10:47am | | The electromagnetic force can also be represented using curvature. |
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| | ajinx999 | Sep 24, 2007 11:29am | @ntltrmllgnc:
Will you explain me about it (or give a link regarding it)?
I suppose you are probably talking about the electromagnetic field (analogous to gravitational field, that is, the curvature). |
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Sponsor | | ntltrmllgnc | Sep 24, 2007 12:30pm | yes, field my bad.
the idea is that electric spacetime is curved which then causes charges to take a curved path
the big leap to make it work is to define charge as analogous to mass, energy in terms of charge, a relativistic "increase" in charge close to the speed of light and a curved path for objects with no charge (like the photon goes on a curved path even though it lacks mass)
heck there might even be a maximum speed of charge just like light is the maximum speed of mass
make all those work and you have electric curvature
then again there's this comment. |
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Sponsor | | disconcision | Sep 24, 2007 1:39pm | 9: Although gravity is undeniably analogous to electromagnetism in many ways, I think importing the geometrical model from classical GR is slightly disingenuous. This is actually a very rich area for discussion - it's hard for me not to contradict myself. Any force can be interpreted as part of the net field which defines the path of least action for all matter.
But: In GR gravitational attraction is synonymous with acceleration (equivalency). Under this assumption, it's not a stretch to say that 'gravity' becomes a 'fictitious force' in much th same way as the centrifugal. I don't immediately see EM in the same way. It seems at least one step of abstraction removed.
I mean, does the color charge of quarks cause spacetime to bend? What about all the other flavor varieties? It's hard to say 'no', but I don't immediately see a 'yes' as being meaningful.
"heck there might even be a maximum speed of charge"
Wouldn't it simply be limited by the lowest-mass particle possessing charge (the electron(?)), having a free parameter which is the amount of energy available for acceleration? Although I believe Yang-Mills theories posited the existence of chargeless, massless particles I don't think one has yet been observed. If one was, the maximum speed would be c, wouldn't it?
Update: Wait. If there was a massless charged particle (traveling at c), what would happen when it passed through an electromagnetic field? Something very odd I would think. |
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