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Strange

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Posts posted by Strange


  1. 11 minutes ago, michel123456 said:

    Exactly.

    However length contraction & time dilation go hand by hand, you cannot have the one without the other.

    So I reiterate my question: what about time dilation when the observer sees a universe that as you states "will appear to be 11 metres long to the pilot in the direction of motion", but

    "in a direction at right angles to this the universe will appear to extend to its usual limits, whatever they may be" ?

    It is a rotation between the time dimension and one spatial dimension (the one corresponding to the direction of travel)


  2. 19 hours ago, StringJunky said:

    If you start with 22000 genes, and in each generation backwards, it halves until you are left with one gene shared, your identifiable genetic relationship with that line ends. in about 14-15 generations. This is how I understood it but could be wrong. Assuming a gene is some indivisible unit of heredity.

    Interesting way of looking at

    10 minutes ago, Royston said:

    Today I learned, after a seagull knocked some off my roof, that the humble Lichen is a composite organism. It is a symbiotic relationship between cyanobacteria and fungi. Nearly 6% of the Earth is covered in Lichen, which is testament to, if you get along, you'll be successful. 

    https://en.wikipedia.org/wiki/Lichen

    Some are symbiotes of three organisms: Cyanobacteria, fungus and yeast

    https://science.sciencemag.org/content/353/6298/488

    Today I learned that “lichen” is also the name of several (rather unpleasant) skin diseases 


  3. 2 minutes ago, gamer87 said:

    I don't have the manufacturer's contact number I bought from a dealer

    That is why I said "supplier".

    There is no point asking here. No one can tell you about an unknown adhesive from an unknown supplier made by an unknown manufacturer.

    At least you could ask the supplier whether the bags and labels are suitable for your purpose. Or ask who the manufacturer is, then ask the manufacturer if they are suitable.

    The amount of time you have spent on this forum asking people who cannot know, could have got you an answer by now.


  4. !

    Moderator Note

    I would also suggest you make an effort to put your threads in the appropriate place. Moved to Suggestions, Comments and Support.

     
    11 hours ago, farsideofourmoon said:

    Before you stuck your but into this discussion a few posters were trying to honestly discuss the energy potential of converting sewage treatment plants into self-sustaining facilities.

    There was no discussion of that. It barely got a mention in your opening post.

    Feel free to open a serious thread on the topic. But you might want to read up on some of the hundreds of projects doing this already, before posting.

    Call me old fashioned, but I just think the combination of immature humour and ignorance is not the best possible start to a discussion of the science and technology involved.


  5. 9 hours ago, gamer87 said:

     

    is this glue from the bag and the label acidic?

    How do you expect anyone to answer that. 

    35 minutes ago, gamer87 said:

    I am not able to perform this test

    Of course you can. Buy some litmus paper. 

    36 minutes ago, gamer87 said:

    but use the same type of bag and label as those that come with aliexpress products

    If you are worried about corrosion, you could try putting dessicant (SiO2) in the bag with product. 

    But if you are using these bags and labels, maybe you should ask the supplier. No one here can answer. 


  6. 1 hour ago, gamer87 said:

    what compound of this glue bag and glue label this photo?

    How do you expect anyone to know that? There are thousands of adhesives in use.

    Why do you want to know?

    1 hour ago, StringJunky said:

    I happened to read not long ago that ordinary plastic is permeable to gas, and electronics that need to be stored for any time gas-free are put in that metallized plastic stuff.

    I am not surprised. (Certainly more plausible than the adhesive being a problem.)


  7. 4 hours ago, King E said:

    How will the molecules on the bottom escape as vapours?

    To give an even simpler answer: they get to the surface and then escape! 

    That may be too simple to be useful. But as you add heat from the bottom, it will cause convection which brings those molecules up to the surface. Also, as the fastest molecules at the surface escape, the average kinetic energy of the top layer decreases; in other words it cools and so will sink lower in the container.


  8. 2 hours ago, John Cuthber said:

    To be fair, while "zero" is the right answer, it's not obvious.

    Fair. It should be well known; but it is an extremely surprising result.

    4 hours ago, BorisBoris said:

    What would be the gravity on the inner surface?

    It would also be interesting to know what the strength of the material would need to be. Presumably, far beyond anything that exists in nature.


  9. 26 minutes ago, joigus said:

    I once learnt that in Wales there is a place which has one of the longest toponyms. There seems to be a Maori toponym that is longer.

    How about a weekend in,

    Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu?

    If that's too much of a stretch, you can always stay at,

    Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch

    I'm sure those are sentences in disguise!

    Not forgetting Chargoggagoggmanchauggagoggchaubunagungamaugg in the USA (although I think some extra syllables were added to that one).

    And, apparently:

    Quote

    This name is often shortened as Llanfairpwll or Llanfair PG for brevity. This is the name of a large community of villages in Wales found on the Islands of Anglesey. Initially, this community was referred to as Llanfair Pwllgwyngyll before its name was changed in the 1860s for promotional purposes.

    https://www.worldatlas.com/articles/the-10-longest-place-names-in-the-world.html

    And the full version of Taumata translates as "the place where Tamatea, the man who had big knees, the climber of mountains, the slider, the land-swallower that traveled about, played the nose flute that he had to the loved ones" (ibid).


  10. 5 hours ago, Enthalpy said:

    The polymer matrix is often polyurethane, which interferes with our hormone mechanisms.

    Citation needed

    5 hours ago, Enthalpy said:

    Goods manufacturers use it as a cheap replacement and label it "leather" with absolutely no distinctive word nor label. Possibly, legislation allow that when the mass proportion exceeds 50%.

    Citation needed 

    5 hours ago, Enthalpy said:

    It can also be other polymers, very often loaded with plasticizers to imitate leather's bendability, and these plasticizers use to be toxic and migrate out of the polymer over time.

    Citation needed 

     


  11. !

    Moderator Note

    The rules require you to provide the information here and just post a link.

    But I would remind you that this is a science forum, so I'm not sure why this thread should remain open. 

     
    41 minutes ago, BorisBoris said:

    What would be the gravity on the inner surface?

    Zero, obviously.

    Also, your link contains no evidence for the Earth being hollow. 

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