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geordief last won the day on August 31 2018

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  1. Plead ignorance at this stage in my life but how dods this process happen in the body? When I eat my meal there are both liquids and solids. Clearly they are separated somehow.Does this occur in the stomach? There can't be a Trump recommended centrifuge down there so how does the process get started (are there a few stages ,perhaps?)
  2. Thanks for putting me right. Are there other things that those observers do agree on ? Can they agree i your scenario when they compensate for the difference in their gravitational potential? Is that kind of information always available to them in principle?
  3. I struggle with the simple maths (and the implications thereof) of basic special relativity . So I can't with confidence say that it makes good sense or bad sense. (I will try to reread it a few times and it may become clearer) Edit: have dug up this very old old response from Markus to me where I asked him about the space time interval . http://www.thescienceforum.com/physics/41968-space-time-interval.html At the time I took it to mean that it was invariant in both inertial and non-inertial frames. As I said then ,I found that reassuring (because the physical world seemed to make a little(a lot) more "sense" to me as a result Hope I didn't misinterpret at the time.
  4. My pipe is so long (the stretch I suspect is over 30 metres and others are longer) that I would not have confidence in a length of stiff kerosene piping going the distance since I am confident there is corrosion having repaired holes in the past. What it might do ,I suppose would be to actually locate the area that is holed. . Then I could dig down with confidence and maybe get some more years of life out of the system. I have used this stiff kerosene piping to unblock the sewage drains in the past .Again ,it can allow you to locate sections that are cracked so that you can repair them or ,with patience and flushing it allows the blockage of paper and excrement to make its way to the end. Those are much wider pipes ,of course . Since I repaired that cracked section there is much less maintenance and flushing works when necessary or ahead of time.
  5. Sounds good to me.Yes ,I should have chosen a location removed from spacetime curvature,even though I still hope that the spacetime interval may be invariant under those conditions too. I wasn't aware it was easy to synchronize clocks like you said and that is why I assumed there would have to be signal capture at E and M.
  6. I wondered where that post of mine went.I was going to delete it as that kerosene idea was a bit barmy but I couldn't find it for whatever reason. Sometimes the software on this site is a step ahead of me.... I had the kerosene idea since it leaves rainbow coloured stains in the soil. I just use this water for the garden really. It is a pretty ancient system ,one inch metal pipes now well corroded with ,I suspect one or two leaks along the line held together by compacted soil. I did once attempt to dig it up starting from one end but ran into lots of fuscia and ivy roots as well as a disappearing pipe...
  7. We don't get many dry spells here. I have waited for them and searched then but the area is pretty overgrown and ,for all I know the pipe may go under a rocker/flower bed(I didn't put it in) It might be more obvious I'd have thought .... actually what would be obvious might be to put a a bit of kerosene in the pipe but I'd hesitate to do that as it would harm the insects and I might need a lot if the leak is a long way along the pipe (it goes about 100 metres at a guess)
  8. I have a leak that I am finding hard to pinpoint and I have an idea to put dye in at the in end and see where it comes up. Is there any dye that would work better than others? The pipe is running under a gravel courtyard and so it should be easily visible if the dye comes up (maybe a foot at most) to the surface. Otherwise it continues through a long section of the long grass of an overgrown orchard and I have never discovered a damp spot so would simply need to replace the whole length of this ancient outdoor plumbing if that is where the leak(S?) is. This is not drinking water so I can be quite unrestricted in any dye I use.
  9. If we put an observer,E on Earth and another observer ,M on Mars and present both with 2 events , S(1) and S(2) on the Sun , and visible to both is it possible to show that E and M both measure the spacetime interval between S(1) and S(2) exactly the same? So ,if the expression is s^2 = (ct)^2 -r^2 and both E and M measure the same quantity from their respective frames of reference what would be the actual measurements needed to be performed by E and M,? I imagine that both would time the difference in signal capture between S(1) and S(2) and would also somehow measure the physical(spatial) distance between the sites of S(1) and S(2) Would those measurements be the ones that would show that the spacetime interval between the 2 events on the Sun as being invariant? (let's say they were 2 sunspots appearing one after the other) Or have I ,as I often have got the wrong end of the stick again?
  10. Is that because the sources of gravity (the sources of the gravitational accelerations) are multi-directional? I f the gravity field was infinitely large there would be no curvature? I just meant it as a joke at my own expense
  11. You are not saying ,are you that there is any point in the uniformly accelerating room where my two parallel beams of light can be judged by an observer to be Euclideanly parallel? I thought such parallelness was only a feature of spacetime devoid of gravity.
  12. Suppose the observer at x,y,z=0,0,0 in the accelerated room sends a pair of "parallel" beams in the direction of 1,1,1 will she adjudge them to meet in the distance or remain parallel? And the same question for the room in the gravitational field (either from a small source such as a black hole) or an infinitely large source) Feel flattered to have graduated to the level of this "common misunderstanding"😣
  13. Suppose one is an observer in Einstein's famous sealed portacabin in empty space and the living space is accelerating at a regular rate in the direction away from the "floor". (The room is a cube of 1x1x1 unit measurement) Now ,under the equivalence principle the scenario is very ,very similar to that of an observer whose room is not under acceleration but rather subject to the gravitational influence of a massive body positioned in the opposite direction to the earlier acceleration. So ,as I see things the acceleration obtaining in the first scenario should be causing a curvature of spacetime in more or less exactly (ie minus tidal effects) the same way as occurs in conditions of gravity. If I have understood this right so far ,could I get a little help so as to set up measuring equipment in my accelerating sealed room so that I can measure the curvature in spacetime in a region of the room and see how the spatial measurement change vis s vis the temporal measurements? Suppose I have an observer on the floor and place her ,with a clock at the x,y =0,0 point of that floor (or x,y,z=0,0,0 of the room) can I place another clock at ,say 1,1,1 and measure the distance and times both with and without acceleration? Will this setup allow me to observe the curvature of spacetime in the room?
  14. I see ; not infinite but greater than c? What about if there were an infinite number of "v" s that were added ? Any scenario that would allow for that? Would that imply a theoretical infinite speed in Newtonian physics? (I don't think Newton was aware of the relativistic addition of velocities even if that was known before Einstein....)
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