geordief

Too late.I have you pigeon holed!

Do they have any gravitational effect at all? I thought acceleration and gravity were more or less the same thing.

A few years now since I bought any ,but I don't recall it being difficult to get then I know very little about choosing wine and was just following a recommendation from another cook(I try to keep things simple and repeatable)

No(now I am just imagining this) I thought perhaps that the huge number of tiny accelerations within the Earth ,and over the length of time the Earth has existed might perhaps add up to some overall effect.

Completely ignorant of that film.I seem to have been providing a faux plonk over the years. I did find this resumé of the situation, though https://www.theguardian.com/lifeandstyle/shortcuts/2017/oct/04/merlot-comeback-wine-grape-surviving-sideways-effect

Are you on the sauce again?

Does the Earth generate gravitational waves as a result of all the em attractions/repulsions within it? Are the atoms in constant accelerated motion and does that cause gravitational waves in the same way as em radiation is caused? I have been thinking about what happens when 2 objects come close to each other and their motion is changed by ,eg electric repulsion. It seemed to me that there might also(in addition to the em wave) be a gravitational wave as a result of the acceleration.

It must be, but it has to be from their body language I would say if we can't use their clothing sense.

Without wishing to seem snobbish,it would be stupid to try to inculcate one's own sense of taste upon others(lethal in the case of peanut butter,I hear) I recently bought a mobile phone car charger and was reassured by the shiny packaging and the high(25eu) price. it was a complete waste of my money as it drains quicker than it charges 😒

i think you are over egging this 😉

Well I suppose that if a variety or an example is evocative then that could be called an intrinsic quality. But ,I don't think it is controversial to note that tastes and perceptions evolve over time . And scarcity drives perceived value right up and down the "food spectrum" As per dim's earlier remark Gin used to be consumed by the pint glass and was indeed healthy insofar as it was better than the filthy water available to people then. When I used to buy wine for the customers I chose a wine that I thought might give least offense (Merlot ,as it happens) 😃

I don't think the wine was intrinsically better (if you were saying that) but that it met the general expectation of how it might taste. If that bottle had given everyone a headache and a deli belly maybe their taste judgement would have changed down the road. I never drink (or eat) except in combinations and have no understanding why anyone drinks wine or similar on its own (obv they do)

Suppose we have a trampoline moving through the vacuum of space At any snapshot in time (so not 4d) the trampoline will look to us in it's normal flat shape Now let us say that a region of the trampoline is subject to an acceleration (for simplicity perpendicular to the surface) so that that region is stretched into the shape all trampoline analogists are familiar with except that there is no heavy metal object producing the "well" but rather the shape is produced "internally " by the local acceleration.** So an observer at a remove from the "flying trampoline" will see a flat surface with a protrusion a bit reminiscent of Sigourney Weaver's belly in Alien. If we now put ourselves in the frame of reference of the flat part of the surface and look around at what we can see from that frame then we will see whatever we will see. But if we similarly look around from the region of the protuberance (if the acceleration has been significant) then the same scenes will be visually distorted and light coming from the same place as was seen by the people on the flat ,unaccelerated region of the trampoline will be coming from a different direction and either sped up or slowed down.(am a little unclear here) Does the trampoline viewed this way provide a good model, not of gravity but of the effect of how light is curved when a frame of reference is accelerated wrt a source of light? Does the trampoline analogy work better for acceleration than gravity? ,**it is just a small,local region of the trampoline that is accelerated and not all of the trampoline.

I seem to remember (in the 70s) that certain regions of France were permitted by the government to add sugar to the grape juice which resulted in a higher alcoholic content. I think regions that could not do this felt hard done by and so I think that too low an alcoholic content must have made the product less saleable. I have no idea if the practice continues. I remember that the grapes used for champagne had a low alcoholic content (possibly necessarily so as I think the whole process is quite different to ordinary wine)

Thanks so much @md65536 and @Markus Hanke That was quite some detail and probing I did "sign off " half way through this (my) thread but am glad I was able to (come back and (re)read it all the way through. Hopefully some of it will sink in. And ,yes the OP was all about GR,in my mind anyway

A joke in a dream. I was watching (as per in the dream) a young precocious Shirley Temple lookalike being interviewed as to where her parents (or similar) were living. She answered "in a cabin"(indicating ,I gathered her humble origins/connections) ,followed immediately by "in space" (indicating the opposite -like it was something really fancy and exclusive) That is some kind of a common joke trope I think but it is the first time I have been so "joked" in my dreams (I think the "audience" was "goshed" by her repartee)

Thanks.I think I am probably done with the thread now.Quite a bit of info for my level.

Is that because mass is a relativistic concept? (I understand that the bonds that hold an object together are calculated as "mass";does relative motion btw objects also contribute to a system's mass?

At the exact point in time *then that the two (relatively moving or relatively at rest) objects' effect on the spacetime curvature is calculated (so hopefully stripping out all dynamic effects**)- are the two effects identical? * when the two objects are as close as possible **if it can be done,maybe finding the number value of the tensor resulting from all its components. Well the masses could be very big even though I was imagining them as small in the OP. Are two two curvatures identical or is the one involving approach speed greater ?

OK ,so from the frame of either of the two objects in scenario A the other approaches and in scenario B the other is at rest and close proximity. So scenario B curves spacetime less than scenario A? Is the momentum of an object one of the elements in the curvature tensor?

Is spacetime curvature frame dependent? (In my second scenario both objects are at rest wrt each other,I think)

Suppose we have two massive spherical objects and they are moving wrt each other. They pass each other at one point . Do their respective momentums (in addition to their mass) combine to curve spacetime at that point? Again (a different scenario) ,if the same two massive objects follow the same trajectory as each other do the pair also curve spacetime ,but differently from the earlier scenario? Ps Am I barking up the wrong tree to try and separate curvature effects due to mass from curvature effects due to momentum and are they perhaps two sides of the same coin?

Ectually she takes after her mother's side of the family (more Rt.Hon than right on) and pronounces that fish as "barse". I flounder when trying to cope with that tomfoolery.

I tried telling that quip to my daughter but just got a deadpan expression.

I am wondering about this supposed spat btw Wagner and the Russian army " Wagner boss Yevgeny Prigozhin has complained of a lack of ammunition, saying it could be "ordinary bureaucracy or a betrayal". https://www.bbc.com/news/world-europe-64859780 Smoke and mirrors or are we looking forward to a Russian retreat quite soon?