@NovaliumCompany capitalism has a substantial dark side that is becoming more apparent aka "neoliberalism, late stage capitalism, predatory capitalism" etc. one model along the lines you propose is widespread nonprofits, my understanding is canada has success with this model. think JR has point about trying to avoid dualistic thinking wrt political/ economic philosophies. & marx was far more prescient than anyone gives him full credit for. he basically was focused on/ foresaw wealth inequality...!
@vzn I've never said that capitalism is better than communism and I've never said that capitalism has no flaws. What I'm saying is that I have two views on the subject: If I had to choose a government for myself to live in, I'd choose a government which allows me to personally get my hands on huge resources which I can allocate to places of my choice. I'd want to have control over what's going on and not just submit ideas and patents to a board of people.
The second point of view I have is that if I had to choose a government system for the world, I'd choose a system that allows for the most productivity and innovation, not necessarily happiness or equality. I know this might sound a bit wrong, but that is me. I'm not saying that people should not feel good, I'm saying that, in my opinion, innovation and productivity are more important than the release of dopamine in someone's brain.
@NovaliumCompany read what you wrote. like that you seem to be trying to think out of the box, and applaud that. some would say the results are in on capitalism, and that its a failure. some new system(s) need to be devised/ put into play ASAP. its happening as we speak. a lot is riding on it. future of humanity, future of the planet/ nature. you outline the key areas to address. innovation, productivity, resource allocation, happiness, (in)equality, dopamine, etc lol...
@vzn Sorry I don't know what you mean. I'm not proposing a new system nor do I applaud myself. I'm expressing my opinion on government systems or more specifically, "if I had to choose" opinion.
@NovaliumCompany your comments envision a different system than the one we are living in. am applauding you for "thinking outside the box" which, as mass panic/ hysteria now surrounding us underlines, is sometimes an uncommon feat. sometimes conventional wisdom is highly overrated (to say the least... more precisely, sometimes its nearly crazy). en.wikipedia.org/wiki/Shoshin
@YuvrajSingh... You can click on the little arrow on the right to reply to specific messages when you mouse over the message. Right now I'm afraid I don't know what you're referring to.
@YuvrajSingh... And what exactly do you want from me? I don't really have an interest in revisiting that discussion unless it's absolutely necessary.
user434058
"Your shadow is a confirmation that light has traveled nearly 93 million miles unobstructed, only to be deprived of reaching the ground in the final few feet, thanks to you."
Sorry, I'm not in the mood to try to guess what you're talking about. Please state clearly what you want from me and how it relates to what I said, or otherwise don't ping me.
Many years ago,
I noticed that $987654321/123456789 = 8.0000000729\ldots$.
I sent it in to Martin Gardner at Scientific American
and he published it in his column!!!
My life has gone downhill since then:)
My questions are:
Why is this so?
What happens beyond the "$729$"?
What happens in bas...
can you get suspended from school if somebody fought you and even if you didn't fight back I heard that some people said that this happened is this true and if it is then why do they suspend you because they don't know if you punched the other or not or that is the rule they want to suspend every...
Whenever you find yourself hearing one side of a story immediately ask yourself whether the account you've heard is objective and what the other side of the story might be.
@tpg2114 Hello, I hope you're fine and well. I'm about to do the whole experiment we talked about. One thing that's a bit unclear is, how am I going to remove the baked polymer clay model out of the plaster mold? Will the polymer clay stick to the plaster mold while the plaster mold is being formed?
Would it be easier if I don't bake the polymer clay model and I make the plaster mold around the unbaked polymer clay?
If I do so, would the plaster mold turn out still as good?
@JMac @FakeMod For the record, engaging was absolutely superfluous there. That doesn't excuse the other user's behaviour, but...just flag rude comments by other users and don't engage. If someone has started throwing abuse around it is extremely unlikely you will convince them to stop doing that and highly likely you'll just produce more stuff that needs to be deleted later. Let the moderators take the abuse and move on.
I can understand the urge to debate people that are on the border of rudeness, but once someone is just shouting slurs, just walk away. Such behaviour is not welcome here, there is no need to normalize it as something that merits any other response than silent deletion.
@NovaliumCompany not sure on that, I don't think it should stick but you might need to put a release agent on the clay. They use plaster of Paris to make face masks of people and all kinds of stuff, but they might need to put something on the face first
I'd give it a test on a small thing so you don't waste your resources and see if it releases or not, before you do it on your actual model
The Einstein–Hilbert action (also referred to as Hilbert action) in general relativity is the action that yields the Einstein field equations through the principle of least action. With the (− + + +) metric signature, the gravitational part of the action is given as
S
=
1
2
κ
∫
R
−
g
d
4...
Hm...the IT spyware on my work machine just warned me that I'm using more than 10 browser tabs and this "might impact the performance of [my] device". This thing might've been written by someone not exactly familiar with many people's browsing habits or the capabilities of modern hardware :P
@ACuriousMind If you think that 10 tabs can't affect modern hardware, then sit beside a computer with chrome having 10 tabs open... Good place to melt ice.
For the first time in the history, I wrote Stress Energy Tensor of a field, in a single try absolutely correct with non-adhoc method... Ama celebrate this by opening 100 tabs....
I mean we are human beings currently in the chatroom... Ama is different thing, It's I'm/I'll (often used this region) just as woodshowdycwtch are regional words...
I have no idea what you just said. Can you not just answer the rather straightforward question of who you mean by 'we' and what place you mean by 'here'?
@AbhasKumarSinha So by "here" you meant where you live, not "in this chat". It would have been a lot clearer if you just said that when I asked to clarify "who is we". Saying "we are human beings" didn't make it any clearer that you were talking about your region.
@AbhasKumarSinha Obviously here refers to the chair in front of my computer... Usually when you say "here" in those contexts it implies both people in the conversation are at the place you're talking about, or you're directly indicating what "here" you mean (like if there were a picture of a map included).
@JMac fun fact: Today it's sunny and warm enough that I have to either keep the shades closed or the window open so that the room doesn't get too warm. These passive houses make really good heat traps.
Why cant a wave function and its derivative both vanish at a point?
The answer is that for a 2nd order equations like Schrodinger equation,we have unique solutions,and 0 is a solution because it satisfies the boundary conditions. so wave function vanishes for all x
But, x^n for any natural number n also satisfies the condition.So wave function need not be 0 everywhere by this?
Really 0 is the only unique solution to the differential equation with such boundary conditions?
Are there other ways to prove this maybe? It means physically that--"Momentum of a particle cannot vanish at nodes",can we arrive at this from other intuitive reasons?
@ManasDogra There is no "intuition" because it's not true for completely arbitrary systems, only for nice once. For the TISE in one dimension, the uniqueness theorem that applies is Picard-Lindelöf, but if your potential fails to be Lipschitz you get non-unique solutions, just like with classical Norton's dome.
But if you accept the classical statement that a particle "cannot" start to move without a force acting on it because $F=ma$ has unique solutions, then you should also accept the quantum statement that the wavefunction "cannot" have both itself and its derivative vanishing at a point about the SE has unique solutions
The problem with trying to explain even quantum field theory is it is based on some really complicated principles that you wouldn't learn until well into a physics degree. String theory uses even more complicated maths and you probably wouldn't learn it at all at degree level. You'd learn it as a postgraduate course.
@YuvrajSingh... quarks are described by quantum field theory. The concept of a particle arises naturally in QFT, though it's hard to explain exactly how this happens in simple terms.
It does no harm to try and learn a bit about string theory, though I'd be surprised if you get far. What book, web site or whatever are you learning from?
@ACuriousMind if I were an enthusiastic undergrad right now I'd probably be attempting (and failing) to understand string theory lectures. I don't think it does nay harm.
@JohnRennie Freudian slip with the double negation there? ;) Sure, doesn't hurt, I just wouldn't get my expectations up about understanding any of it except the most superficial stuff.
@AbhasKumarSinha BTW, you really don't need to ping me if your responses are just gonna be "okay..." or "k..." That's not really much of a conversation, so pinging me doesn't accomplish much. It's not clear if you're expecting me to say something else, or just trying to acknowledge that you read it (especially with the ellipsis at the end).
@JohnRennie Not so sure that about, linear algebra already has this distinction, and the physicist does reflect this in Dirac notation with bras and kets.
Are these supposed to be equations between known quantities, or definitions of the r.h.s.? It's not really meaningful to ask whether an equation is "mathematically true" when you haven't really defined any of its constituents
because $g^{ij}$ is said to be inverse of $g_{ij}$
@ACuriousMind I mean, can Tensors be multiplied like that (in mathematical sense), if something is not true mathematically, then I can't use those in physics...
@AbhasKumarSinha You haven't answered my question. Are you trying to define a 2-tensor $C^{ij}$ by that equation and you're asking whether the l.h.s. is really a 2-tensor, or are $A$, $B$, $C$ known quantities defined by something else.
@AbhasKumarSinha consider the good old dot product. You might write it as $\mathbf a \cdot \mathbf b$ or you might write $a_ib_i$, but you wouldn't write $a_i \cdot b_j$
I also find it very peculiar that you are now asking extremely basic questions about tensor notation when months ago you tried to ask me rather specific questions about the Ricci tensor
@ACuriousMind trying to run before you can walk is a time honoured tradition amongst young physics students. I think we should at least admire the enthusiasm.
@JohnRennie Okay.... I was just confused with $\otimes$ thing so, I was afraid of doing raising and lowering indices, because it can get wrong... But, now this makes sense...
@JohnRennie I too see in machine learning, they use distribution function notations which are not usually used in Mathematics... they are bit misleading, but people don't care,... :P
I am a bit confused about how to use the VLQ flag. I saw this one-line answer and thus left a comment asking the OP to elaborate and at the same time flagged it as a VLQ answer, because the info of VLQ flag states that:
Very Low Quality: This answer has severe formatting or content problems. ...
Question
I was wondering if the sort of experiment below (or variant) below was already done?
Experiment
Let's say I have I begin with momentum eigenstate $|p_1 \rangle$ after a time interval $\Delta t_1$ I measure momentum again. Then the probability of the transition to $| p_2 \rangle$ is g...
@MoreAnonymous I'm not quite sure what the close voter was looking for in your question. It certainly doesn't hurt to ask for advice, but if it's just one close vote and you don't get any other feedback suggesting improvements, I wouldn't worry about it. Quite a few questions accumulate one close vote and that's as far as it goes.
@FakeMod I don't think there's any mechanism that just bans you on the two sites. Typically it's either a "network wide" suspension, or it's on a per-site basis.
@FakeMod In the interest of being a snoop, you can check through a users network activity and see if there's anything that suggests they might have been banned from another site; like as an example, they might have posted a thread to meta SE asking what's wrong with the chemistry community. This would suggest that they also had problems there and one wasn't automatic because of another.
@FakeMod No, mods have power only over their own sites. CMs can ban you network-like, and sometimes they do. There are only rumors, why are they banning anybody.
For a long time, I have been interested in Relativity and in general, understanding the geometric layout of the Universe; I know that to understand this, I should begin learning Special Relativity
I am currently independently learning Linear Algebra and I believe I have learned a sufficient amount of theory to begin Special Relativity
@FakeMod Some people are mods on multiple SE sites. I never heard about that such a mod had punished anybody on other sites where he did the offense. It would be a very serious power misuse for them. As far I know, currently no PSE mod is mod on any other sites.
I read Introduction to special relativity by Robert Resnick.
It is a beautiful book as an introduction. I got insights and intuition in special relativity.
I want to learn special relativity at a more deeper level.
Please recommend some books/ research papers for special relativity?
I've found an article where the author in question basically comes up with a proposed equation for how a single muscle would change if you stretched it.
But they don't look at the interaction between two muscles.
My question was closed as off-topic because I was trying to be sure whether something was a typo or not. It involved no physics concept.
Now, I think physics.stackexchange should be broader in their mindset. The goal should be to promote physics learning overall. This could come in the form of i...