Recent content by NSEFF

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    Experimental proof that gravity ~ 1/R^2 ?

    CTHUGHA: Yes, MOND was what I had in mind, though it has been a long time since I ran across this concept and I am not familiar with its current details. TURTLEMEISTER: While the arXiv article appeared to download, I was unable to open the pdf file. This has happened to me before. I think it...
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    Experimental proof that gravity ~ 1/R^2 ?

    TURTLEMEISTER: My understanding, from a cursory reading of the cited paper, is that it is directed primarily at detecting deviations from an inverse-square law at sub-millimeter distances. However, I was unable to access the arXiv.org papers detailing the experiment. So it is unclear to me...
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    Experimental proof that gravity ~ 1/R^2 ?

    What is the experimental proof of Newton's law of universal gravitation? Specifically, how has it been established that the gravitational force between two masses varies inversely as square of the distance between them ( as opposed to, say, as 1/R^(2+x) where x is small |x|<<1 )?
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    Bullet-hole Paradox: Train Frame & Stopped Train Measurements

    Time to close this thread out. The following is the explanation I was looking for: The answer must be 50 ns just as measured in the train frame. This is because as the train slows, observers on the ground will see the train lengthen as the Lorentz contraction effect decreases. The bullet...
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    Bullet-hole Paradox: Train Frame & Stopped Train Measurements

    CLEM: So your contention is that the simultaneously fired bullets did not enter the train 40 ns apart spatially as it appeared they did in the ground frame? That this ground frame viewpoint is erroneous? What is your argument for this? This is principally where my hangup is with the question I...
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    Bullet-hole Paradox: Train Frame & Stopped Train Measurements

    JTBELL: The esssential canonical feature I was referring to was that the position readings at the two ends of the object had to be established simultaneously.
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    Bullet-hole Paradox: Train Frame & Stopped Train Measurements

    PERVECT: As I remarked, Special Relativity does not posit conditions on physical objects, such as rigidity, for the equations to apply. Contraction arises merely due to postulated constancy of the speed of light in all inertial frames, and how the length of an object must rationally be defined...
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    Bullet-hole Paradox: Train Frame & Stopped Train Measurements

    My reply to XTS and CLEM remarks failed to get posted last night. However, at this point, we all seem to be in agreement with the following: (1) In the ground frame the guns are 40 ns apart and the holes in the train are 40 ns apart. (2) In the train frame the guns appear to be 32 ns apart...
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    Bullet-hole Paradox: Train Frame & Stopped Train Measurements

    Bullet-hole "paradox" This is a variant of the so-called "bullet-hole paradox" (the guns can be lasers and the train a spaceship): Two guns are mounted a distance of 40 ns apart (SR unit system) on the embankment beside a railroad track. The barrels of the guns project toward the track so...
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