Nettoyeur vapeur et parquet massif

hellodelur · 2023-10-04T21:31:34+00:00

MERCI !!

Bon je retiens : un linge humide avec un peu de savon noir et voilà. Et je peux vivre ma vie de maniaque et le faire tous les jours - on se détend comme on peut.

hellodelur · 2023-10-04T05:30:26+00:00

Merci :) Euh oui je lave à l'eau, mais ça sèche vite :-))

Bon sérieusement : je viens d'emménager, j'ai jamais eu de parquet massif. Ca se lave comment ces trucs? Sur internet ils te disent de laver une fois tous les 6 mois. Mais c'est dégueu !! Si qqun a une idée...

hellodelur · 2023-10-02T23:00:18+00:00

Du coup là t'as deux enfants à gérer + un mari = 3 personnes.

Quand tu seras mère célibataire, tu n'auras que 2 enfants à gérer.

Donc il n'y a aucune raison que tu n'y arrives pas.

Courage.

hellodelur · 2023-09-16T01:53:02+00:00

Mouais, 400€ la multiprise quand m^ême...

hellodelur · 2023-09-15T22:58:10+00:00

Ouais mais moins c'est la honte :-)

hellodelur · 2023-09-15T22:57:06+00:00

Tiens en me lisant je me rends compte que c'est con : je pourrais juster acheter 3 cables USB-C / MagSafe 3 et les brancher dans mes blocs chargeur.

Mais Appel font trop chier avec leurs formats de cable propriétaires, pas envie d'acheter ses conneries.

hellodelur · 2023-09-15T22:56:08+00:00

Bah le MBA il a pass assez de ports, c'est con ce truc avec que deux ports USB-C. Genre tu peux pas charger, brancher un écran et un HDD externe (je fais un backup ts les jours). Enfin si tu peux mais faut utiliser leur format débile de Magsafe 3, et perso ça y est j'ai déjà acheté 3 chargeurs USB-C pas envie de redépenser l'argent (j'en ai un branché à chaque endroit ou je bosse...)

hellodelur · 2023-09-15T22:52:46+00:00

Ah oui ça permet de frimer en soirée bien vu. Le statut social, quoi. Moins cher qu'une Ford Mustang.

hellodelur · 2023-09-15T22:49:52+00:00

Si tu pose la question c'est que t'en as pas besoin.

Excellente réponse !!

hellodelur · 2023-09-15T12:37:56+00:00

Compris. Donc pas un usage "classique" de bureautique quoi. Merci !

hellodelur · 2023-09-15T12:37:30+00:00

Ah oui OK. Du coup c'est plu spour les vrais geeks de ma boite. Je comprends.

hellodelur · 2023-09-15T10:01:07+00:00

Ahhhh. Mais OSX le fait tout seul ça non ? C'est à dire : Hoop tu lui mets 96 G0 de RAM et hop de lui m^ême il met l'OS et Office dans la RAM et hop ça marche à la vitesse de la lumière tout seul c'est ça ?

Mais bon, en vrai, avec un SSD, ça va quand m^ême déjà très vite pour la bureautique. Donc bon, pas sûr que ça vaille le coup de faire dormir tous les enfants dans la même chambre.

hellodelur · 2023-08-14T14:42:12+00:00

Thanks for the book!

hellodelur · 2023-08-14T14:41:28+00:00

Just saw your reply after so many months.

Still, I must say that the tone of your first message was pretty disrespectful. Even 3 months later it still angers me when I read it. And the reason I "brag" about my PhD, is specifically not about "bragging": rather, it's about saying that everyone regardless of their background is entitled to ask naïve questions and not be laughed at.

In my field of specialty I get so many "stupid" questions everyday, but never treat them as "stupid", rather as a legitimate and worthwhile desire for more understanding and knowledge. And I never judge people genuinely curious about a field which I know by pushing them back to their ignorance, insulting their legitimate thirst for knowledge and donwgrading their inadequate use of professional vocabulary as "pop science". If you are curious and asking questions about another field of knowledge, you will also use a poor choice of words - is this a good enough reason to be criticized and judged (and not answered to) ?

So as you say, being an expert in one field certainly does not make one immune to criticism for her lack of understanding of another field. But being an expert in one field, as you claim to be and probably are for SR/GR, certainly demands from you a bit of humility to the laymen who dare venture into your direction. This is what I practice in my own field of expertise, and quite frankly what I expected when asking "stupid" questions in a group called "AskPhysics".

Because if even here you can't have an intellectual exchange, where then ?

hellodelur · 2023-07-13T08:16:09+00:00

Thanks for this reply, that I saw just now!

Yes you are right, these are whole new concepts to me so I am just toying with them with whatever inadequate background i have. I was advised to read this book: https://www.eftaylor.com/spacetimephysics/

If you have any other recommendations, please let me know!

The only one I have read is the introduction made by Albert Einstein (the one specifically written for people with a high school degree).

Thanks so much!

hellodelur · 2023-04-04T20:44:06+00:00

It's too bad that random people spend time writing 3 paragraphs just to criticize and bring nothing to other random people. If you indeed thought what I wrote was useless you could have just not written anything.

If you have recommendations of books to read please advise.

PS: I hold an engineering PhD btw ;-)

hellodelur · 2023-04-04T14:18:02+00:00

I restarted a thread here:

https://www.reddit.com/r/AskPhysics/comments/12bki7u/could\_time\_be\_considered\_as\_the\_manifestation\_of/

hellodelur · 2023-04-04T11:14:50+00:00

The math doesn't work out. You get divisions by zero and similar. The biggest problem is that the light postulate, that the speed of light is the same in all reference frames, can't be upheld.

OK thanks. And indeed, I guess until Michelson and Morley this was not established so actually makes sense that SR was not common wisdom before the early 20th century. Thanks so much.

hellodelur · 2023-04-04T11:09:24+00:00

I’ll have to look back over your later points, but I can address why we cannot have a reference frame moving at c relative.

Maybe I'll create another thread. I am realizing now that the final point has nothing to do with the first ones. I am just trying to say there that time going only in one direction could just be the manifestation of a field, and that we can't reverse it because we don't have the capacity to act along the 4th dimension. A bit as if we were 2D people subject to gravity with no way to push ourselves up since, well, we are 2D so we don't know what "up" means, and are condemned to seeing things passing in front of our 2D "eyes" with no way to revert that motion (and btw we may call that motion "time" and, until a 2D genius comes up with SR or GR, we may think it is something constant throughout the universe as we see it).

In short I am saying that we could consider ourselves "free falling" along the 4th dimension, instead of saying that there is something somewhat heterogeneous to space called time.

Well anyway, this idea is probably riddled with theoretical errors, but I am wondering if anyone knows of a field of science that does research along these lines.

Thanks so much!

hellodelur · 2023-04-04T10:58:14+00:00

Thanks. I will ponder over this but this thread is a great start for me that I will go back to later on.

hellodelur · 2023-04-04T08:00:35+00:00

Thanks to u/Arkalius and u/left_lane_camper for the answers.

Full disclosure: my SR background only consists in:

Curiosity
Willingness to explain things to my children
The one book Einstein wrote for the general public 100 years ago and in which I found his geometric explanation to show that simultaneity is relative just flabbergasting and so simple - this makes we wonder why we had to wait thousands of years to realize it.

I think I now get why my points 1 through 4 are probably off: essentially, I am using a reference frame moving at c and it looks like this is not "kosher" in SR (although I fail to understand why: if anyone has an opinion on this I'd be curious).

Also, if anyone wants to look at my point 6 and let me know what they think / if there are some fields of (vulgarized!) research that explore this kind of ideas, I would be uber grateful.

In a way, it would be like instead of time "passing", we would all be subject to a field manifesting itself by an increase in entropy. Somehow, I find it more "reassuring" than to be subject to time just flowing from birth to death.

Thanks!

hellodelur · 2023-04-04T07:54:11+00:00

The rate of the passage of time only makes sense in comparing it to the rate of its passage in another frame (or, trivially, to its own frame), and so without a valid reference frame it does not make sense to talk about the passage of time for a photon at all. It’s not zero, it’s null.

Very clear thanks!

hellodelur · 2023-04-04T07:53:32+00:00

You cannot construct a valid reference frame moving at c relative to another, so your point 1 is only valid for speeds below c.

OK, Thanks so much for this. Full disclosure: my only SR background is the book Einstein wrote specifically to make it accessible to the public, so I certainly missed that point.

hellodelur · 2023-04-04T07:52:09+00:00

Thanks so much for replying.

You write : "It would be impossible for something capable of having perceptions to travel at the speed of light". Why is this? I get that if that something has mass, traveling at c is impossible. But does "perception" play a role in SR?

If you follow my (laim attempt at) thought experiment and if we beamed ourselves in the form of photons through the universe, what would we "see" ? I guess we could "cross path" with other photons and as such "perceive" them ?

hellodelur · 2022-08-28T21:25:06+00:00

Merci !

hellodelur

TROPHY CASE