Strange Posted May 14, 2017 Share Posted May 14, 2017 It was my understanding that space/time both existing and existing as a single entity we simply percieve as two different things, is a fundemental premise of everything we know on the subject. And that without this premise assumed true then everything else just doesnt work. Is this understanding of mine false? Sounds reasonable. Link to comment Share on other sites More sharing options...
Thorham Posted May 14, 2017 Share Posted May 14, 2017 That is true in both cases. Yes, but we can see orbitals, while, as far as I know, we can't see space time curvatures. All we can see are the effects of what space time curvature describes or, if it's physically happening, causes. I'm not sure what you mean by "physical". Space is the distance between things and time is the, err... "time" between things. Space would be room for 'stuff' to exist in, while distance is the difference between two points. For the mathematical model it doesn't matter what you call it, as long as you get the right output for a specific input. But when we measure things, there is obviously a distance or interval involved. It's about the fact that the atoms interact. It's physically happening. What's physically happening in the case of gravity doesn't seem so straightforward. Space and time seem more obvious than electron orbitals to me. I can see distances and time passing. I can measure them. Not to me. The orbitals are really physically there as described, but do space and time exist as described? It is only possible to see orbitals with very specialised equipment. Doesn't matter, as long as we can see them so that we know they exist. Also, all of our senses are highly specialized 'equipment' too Link to comment Share on other sites More sharing options...
swansont Posted May 14, 2017 Share Posted May 14, 2017 Yes, but physically space might just be nothing, while time could simply be the speed at which things happen and not some physical thing. Or, they could both be something completely different. Who is advocating space and time being some physical substance? example / If the momentum is = to X force, and ; is a force moving an object, then it must have an opposite force that is = X also and that opposite force happens to be the ''laser'' it self,,therefore the laser must be fixed stationary to give rise to the compressed wave to accumulate momentum in time . You still haven't explained what the significance of a compressed wave. It seems central to your thesis. You need to explain and describe what this is. Link to comment Share on other sites More sharing options...
humility Posted May 14, 2017 Share Posted May 14, 2017 (edited) This made me wonder just now, does the equal and opposite reaction rule apply to light? Because thats a Newtonian rule but light is a quantum thing. And lots of Newtonian rules dont apply to quantum mechanics. Edited May 14, 2017 by humility Link to comment Share on other sites More sharing options...
KipIngram Posted May 14, 2017 Share Posted May 14, 2017 Yes, I think a flashlight has a small amount of recoil, equal to the total momentum of all of the photons it emits. Link to comment Share on other sites More sharing options...
Thorham Posted May 14, 2017 Share Posted May 14, 2017 Who is advocating space and time being some physical substance? No one is advocating anything. I just wondered what gravity is physically. Link to comment Share on other sites More sharing options...
Strange Posted May 14, 2017 Share Posted May 14, 2017 And a reflective solar sail gains twice as much momentum from reflected light as would an absorbent one. Link to comment Share on other sites More sharing options...
Roger Dynamic Motion Posted May 14, 2017 Author Share Posted May 14, 2017 And a reflective solar sail gains twice as much momentum from reflected light as would an absorbent one. Why does it ''Gains'' twice as much momentum from reflected light as would an absorbent one. Link to comment Share on other sites More sharing options...
KipIngram Posted May 14, 2017 Share Posted May 14, 2017 An absorbent sail acquires the momentum of the photons that impinge on it. A reflective sail reverses the direction of the photons that impinge on it. So the photons undergo a momentum change equal to twice the momentum they were carrying prior to impact. The sail acquires that full amount of momentum. 1 Link to comment Share on other sites More sharing options...
humility Posted May 14, 2017 Share Posted May 14, 2017 (edited) If you put a photon inside a mirrored box, will it bounce forever? Edited May 14, 2017 by humility Link to comment Share on other sites More sharing options...
Strange Posted May 14, 2017 Share Posted May 14, 2017 If you put a photon inside a mirrored box, will it bounce forever? If the mirrors were perfect, yes. In reality, no. Link to comment Share on other sites More sharing options...
humility Posted May 14, 2017 Share Posted May 14, 2017 And each bounce on the perfect mirrors would impart a small amount of energy. Sounds like a potential exploit to gain infinite energy. Just make the top of the box out of microscopic pistons. Then make a billion boxes. Link to comment Share on other sites More sharing options...
KipIngram Posted May 14, 2017 Share Posted May 14, 2017 Well, I think that by definition a perfect mirror would not absorb any energy. It would just reflect the photon and leave it otherwise unchanged. Link to comment Share on other sites More sharing options...
humility Posted May 14, 2017 Share Posted May 14, 2017 Dang, and here I thought I solved all of the universe's problems. What does long radiation decay into if you put it inside a flawed mirror? Link to comment Share on other sites More sharing options...
KipIngram Posted May 14, 2017 Share Posted May 14, 2017 I'd guess that it winds up heating the mirrors? Link to comment Share on other sites More sharing options...
DanTrentfield Posted May 25, 2017 Share Posted May 25, 2017 (edited) Gravity F~ can move and displace matter,,,energy cannot. One flaw: You assume energy cannot do work. Energy can do work, and Therefore gravity can be energy and still do work. But at the same time gravity is a result of the curvature of space, because mass distorts space and creates gravity wells, so it is hard to say if it is a force or an energy. Edited May 25, 2017 by DanTrentfield Link to comment Share on other sites More sharing options...
Roger Dynamic Motion Posted June 9, 2017 Author Share Posted June 9, 2017 How do photons slow atoms down if this is true?possibly with the help of fermions in the pat . Link to comment Share on other sites More sharing options...
swansont Posted June 9, 2017 Share Posted June 9, 2017 possibly with the help of fermions in the pat . Do you have an actual answer? This "winging it" approach is getting tiresome. Link to comment Share on other sites More sharing options...
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