Description:
Discussion sur les mathématiques.
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EINSTEIN WRESTLING WITH AN UNSOLVABLE PROBLEM
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[link] John Stachel: "But here he ran into the most blatant-seeming contradiction, which I mentioned earlier when first discussing the two principles. As noted then, the Maxwell-Lorentz equations imply that there exists (at least) one inertial frame in which the speed of light is a constant regardless of the motion of the light source. Einstein's version of the relativity principle (minus the ether) requires that, if this is true for one inertial frame, it must be true for all inertial frames. But this seems to be nonsense. How can it happen that the speed of light relative to an observer cannot be increased or decreased if that observer moves towards or away from a light beam? Einstein states that he wrestled with this problem over a lengthy period of time, to the point of despair."... more »
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La Perla Brillante.
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--- o=0,01=cm --Intergrale del cono r=6o,h=8o.
o^3=o=(r^2*h*pi)/(3h^2)
o^3=o=((6o)^2*8o*pi)/(3*(8o)^2 ) = 4.71238898o^3
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\/\/\/\/\/\/\/\/ 15o *o = 70.68583471 cm^3
\/\/\/\/\/\/\/ 13o *o = 61.26105674 cm^3
\/\/\/\/\/\/ 11o *o = 51.83627878 cm^3
\/\/\/\/\/ 9o *o = 42.41150082 cm^3... more »
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Petit pb amusant
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Récemment en zappant sur les chaines TV internet, je suis tombé sur la chaine Campus (de mémoire) où un prof de math de Terminale expliquait les méthodes pour préparer son bac.
En début d'émission, il a posé ce problème :
Peux-t-on construire une suite d'entiers consécutifs aussi longue que... more »
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sqrt(a)+sqrt(b)
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bonjour
sqrt(x)+sqrt(y)=sqrt(z) sss
sqrt(a^2+b^2)+sqrt(a1^2+b1^2)= sqrt( (a+b)^2+(a1+b1)^2)
avec (a1*b)^2=(a*b1)^2=a*b*a1*b1
et x= a^2+b^2 ,y= a1^2+b1^2
après avoir démontré cette relation
démontrée que quelque soit x et y a,b,a1,b1
existe tel que (a1*b)^2=(a*b1)^2=a*b*a1*b1 bien sur... more »
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Perles, manent
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La formule ssuivante, pour trouvere le volume de
qualconque tronc de conus, en savant la valeur du conus
minime (dx^3)=o^3=4.71...cm^3.
Et, savant le numero de dx^3 relatif sur chaches seciones
du tronc de conus.
ex, dans l'interval, pour h, \ 7o a 9o \ on ha :
Sum,int.\ 7dy, 9dy \ = o*16dy = 75.39822..cm^3, (o^3).... more »
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THE SHORTEST REFUTATION OF EINSTEIN'S RELATIVITY
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The observer starts moving towards the light source with speed v so the frequency he measures shifts from f to f' and the speed of light he measures shifts from c to c'. f'=? c'=? [link]
Roger Barlow, Professor of Particle Physics: "Moving Observer. Now suppose the source is fixed but the observer is moving towards the source, with speed v. In time t, ct/(lambda) waves pass a fixed point. A moving point adds another vt/(lambda). So f'=(c+v)/(lambda)."... more »
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Volume de cono.
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--- o=0,01=cm --Intergrale del cono r=6o,h=8o.
o^3=(r^2*h*pi)/(3h^2)
o^3=((6o)^2*8o*pi)/(3*(8o)^2) = 4.71238898o^3
.
\/\/\/\/\/\/\/\/ 15o *o = 70.68583471 cm^3
\/\/\/\/\/\/\/ 13o *o = 61.26105674 cm^3
\/\/\/\/\/\/ 11o *o = 51.83627878 cm^3
\/\/\/\/\/ 9o *o = 42.41150082 cm^3... more »
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AMUSING USES OF EINSTEIN'S ABSURDITIES
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[link] Parabola Volume 35, Issue 1 (1999), LENGTH AND RELATIVITY, John Steele: "In a previous issue issue of Parabola (Vol 29 No 2 p.2), I discussed the effect on time measurement of Einstein's two postulates of Special Relativity. These two postulates are: 1. the laws of Physics are the same to any inertial observer and 2. there is an inertial observer for whom light signals in vacuum travel at a constant speed in all directions whatever the motion of the light source. (...) The Pole in the Barn Paradox. Now we know about length contraction, we can invent some amusing uses of it. Suppose you want to fit a 20m pole into a 10m barn. If the pole were moving fast enough, then length contraction means it would be short enough. (...) Hence in both frames of reference, the pole fits inside the barn (and will presumably shatter when the doors are closed)."... more »
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