The h Bar

Pseudophysics is a pseudoscientific practice using the language of physics or discussing issues related to or pertinent to physics to promote ideas which are either incomplete, incoherent, or contradictory to known physics. According to physicists, skeptics, and science writers, pseudophysics tends to be promoted by so-called "cranks", whose ideas lack peer review, lack falsifiable predictions, and/or blatantly contradict scientific facts and experimental results. Mathematical physicist John C. Baez famously invented a crackpot index to give an idea of what sort of claims and rhetoric were ...

Sir Cumference

Oh that sounds like the post I found

Mew

@koolman which question, pls provide a link

user246160

@SirCumference No no. He believes in his own version of Modern Physics !

user246160

8:30 AM

LOL

Wait

what's iohydrogen

@Mew idk

if we don't know, that doesn't mean it doesn't exist tho

maybe he just knows more than us

Sir Cumference

8:31 AM

Maybe

koolman

physics.qandaexchange.com/?qa=453/interference-experiment

Sir Cumference

But what are the five extended fundamental forces?

Mew

lol

must some classified physics i've never heard of that either

user246160

@Mew Hydrogen made by Apple INC XD

koolman

physics.qandaexchange.com/?qa=456/…

Sir Cumference

8:32 AM

@Mew Can't find anything on it online

Mew

@koolman the first one you've linked is bad

because

koolman

Why

Mew

you're approaching the site in the wrong way

it's not about helping u to understand textbook solutions

it's about how to solve the problem

the textbook solution in that problem is quite vague

user246160

Maybe they mean this

user246160

Biohydrogen

Biohydrogen is defined as hydrogen produced biologically, most commonly by algae, bacteria and archaea. Biohydrogen is a potential biofuel obtainable from both cultivation and from waste organic materials. == Introduction == Currently, there is a huge demand for hydrogen. There is no log of the production volume and use of hydrogen world-wide; however, consumption of hydrogen was estimated to have reached 900 billion cubic meters in 2011. Refineries are large-volume producers and consumers of hydrogen. Today 96% of all hydrogen is derived from fossil fuels, with 48% from natural gas, 30% ...

Mew

8:33 AM

so if you are going to refer to it

please expand in your own words your own approach to the problem

and where you got stuck

then you may refer to the solution, but I want to see your attempt first, not the textbook attempt

Sir Cumference

@Doraemonドラえもん Don't think that was produced by the Big Bang ;)

I also don't know what "electroscopy" is

user246160

@SirCumference Hehe...everything was produced by Big Bang! (Supposedly )

user246160

Anyway I was joking

Sir Cumference

Or "the charge reversion in a negatively-curved plane"

koolman

But @Mew the person who answered ,he has no problem in ansering such ques

Mew

8:36 AM

@koolman yes but we need to attract more people to the site

to answer questions

and they might be put off if you don't have more dialogue in your questions

like more descriptions

of what u understand etc.

koolman

@Mew i have given whole solutiin , now what description you want

Mew

@koolman that said, the site is still in development and is malleable so feel free to post a meta post about whether ur style is ok and your argument for why ti should be

@koolman the so called "whole solution" is isn't really "whole" it leaves out lots

those textbook solutions are terrible

i mean, if they were good why do you need to ask any quesiton?

so clearly the solutions are bad, so providing them isn't a good description of what u know

u should elaborate on the steps u understand

koolman

@Mew so i can show my work till fourth step

Mew

yep

koolman

@Mew yeah i agree

Mew

8:39 AM

yeah they are

koolman

@Mew just I have little bit explain my steps

Mew

that's why I want to see your work up to that step, not the textbook work which leaves alot out

@koolman exactly

koolman

Ohk I understood it

Now what I shoukd do

Mew

what od you mean?

I can re-open ur questions

Sir Cumference

Sigh...this is gonna sound stupid

But how do I pronounce "deuterium"?

Mew

8:40 AM

but if they are not repaired within 48 hours they will be closed

let's make it 24 hours

Sir Cumference

I've always pronounced it "doo-teer-ee-um"

koolman

@Mew one request

Mew

yeah?

koolman

Can I apply these work when I post new questions

Please reopen the older ones

Mew

huh?

@koolman I will reopen one at a time

which one do you want me to reopon for ur to fix first

then as it's fixed, ping me here with the nextg one to repoen

@koolman are you unable to edit closed questions?

if not i will work on fixing this on the weekend

koolman

8:43 AM

@Mew yes

Mew

k that will be my top priority

G. Bergeron

Are there more users in Eurasia?

Mew

yeah why

koolman

@Mew I mean just reopen my old question . And I will provide my work in new question that I will post in future

G. Bergeron

It seems there is always more activity in the middle of the night for me

koolman

8:44 AM

Please

G. Bergeron

When I should be sleeping

@Mew How do you know?

Mew

@koolman sorry but I can't do that

koolman

Ohk

Mew

@koolman its for ur own good

there is no way sammy is going to answer those 10 questions

it's too many too quickly

G. Bergeron

@Mew This is weird

Mew

8:46 AM

@G.Bergeron what's wierd

koolman

Then please reopen the question for 24 hrs

I will edit it

G. Bergeron

iohydrogen

Mew

@koolman tell me which one to reopen

koolman

@Mew reopen all questions i will edit it at the same time

Mew

@koolman I can't do that because it sends the wrong message to heather

G. Bergeron

8:47 AM

in the sense that's not that you don't know what it is. It sounds pseudoscience-esque and without any references it's BS

Mew

heather will think i disrespect her if i do that

koolman

What wrong message

Mew

Heather will think that I'm just overriding her decision (which was a valid decision)

so that is why I cant reopen 10 questions at cone

it has to be 1 at at time and then that question has to be fixed

then th enext one etc.

koolman

@Mew she has already said that if i edit it ,she will reopen all question

Mew

@koolman I'll reopen 2 questions, if they are edited and I'm happy with the result i'll reopen the rest

which 2 ?

koolman

8:49 AM

Fine

Any two you want

Mew

k

physics.qandaexchange.com/?qa=524/electric-field-density

and this one physics.qandaexchange.com/?qa=515/nuclear-physics

are now reopened

@koolman

@koolman more descriptive titles will also be good

e.g. "nuclear physics" isn't a good title, it is a good tag though

G. Bergeron

@koolman The answer to your question about resistors is that the circuit has a $R=4 \leftrightarrow R=2$ symmetry

The circuit is invariant under this exchange and thus the current configuration will be

no need for any calculations

Here on stackexchange

koolman

@G.Bergeron what you mean

G. Bergeron

@koolman If you exchange the resistors you get the same circuit

koolman

@G.Bergeron which question

@Mew in nuclear physics I have doubt in first step , then how can I ask

Mew

9:05 AM

@koolman is english ur second language?

koolman

Yep

Mew

because "In the above question how they have written the ratio in first step , and how they have use it further in the qustion" doesnt' make sense

I don't really understand what your difficulty is

is it that you don't understand why the have written a ratio there

or is it that you don't understand how they calculated the ratio

koolman

@Mew i mean what is the use of ratio

Mew

or is it both? or what

I see

G. Bergeron

0

Q: Same current flowing

In the following circuit how can we say that the current flowing through both the $4\Omega$ would be same . I know it would be same if in middle the $\frac{2}{3}\Omega$ is not there but here it is here . And for having same current flowing the potential difference should be equal between both...

Mew

9:07 AM

@koolman what is your approcah to these questions

do you look at the answer first?

or do you actually try and solve them yoruself first?

koolman

Then@Mew how can i ask it

Mew

@koolman well technically you should say what YOU tired to do first

koolman

@Mew yes

Mew

not just refer straight to the textbook solution

koolman

Then

Mew

9:08 AM

this isn't a site for working out why textbooks answer questions in certain ways

its a site for how to solve the problem

so saying "why did the textbook do this..." isn't really an on topic quesiton

but saying "how do i solve this question, i've attempted it by doing this ..." is an on topic question

you may then refer to the answer and say, "when I checked the answer, it did it this way."

koolman

@Mew i am asking that how they solve the prob

Mew

you can then say "I don't understand why they approached with a ratio"

@koolman that's off topic

@koolman I'm not saying you can't refer to the book answer at all, but you must phrase the question as though you're trying to solve the problem at hand and where you got stuck in it

hi @Sanya

koolman

Oh

Mew

@Sanya how do you think this question could be improved: physics.qandaexchange.com/?qa=515/nuclear-physics

Sanya

hey @Mew

Mew

9:12 AM

given his problem is with the very first step

G. Bergeron

@Mew Wouldn't a "philosophical" discussion on why a textbook approaches a topic a certain way be relevant?

Sanya

First things, I think posting a picture or scan is something disrespectful and I generally refuse to work on these kind of questions

koolman

@G.Bergeron whats your problem with that ques

G. Bergeron

@koolman which one?

Sanya

then the problem/question is not clear at all

koolman

9:13 AM

@G.Bergeron electric circuit

Mew

I agree it's not clear

Sanya

so I think they should completely rewrite it and state clearly what they do not understand where

Mew

Englihs is @koolman's second language that is his struggle

koolman

What you mean @Mew

Mew

well most of the questions make no sense

I can kind of guess what your asking, but often it's not 100% clear what your asking

koolman

9:15 AM

@Mew but answers to them help me very much

user246160

@koolman Whenever you are asking any problem-based question on any Q and A site, write down your entire thought process and say WHICH CONCEPT is giving you trouble. You can't just say "I don't understand the solution given in my textbook". I saw some of your questions and it seems you are asking people to explain everything step-by-step which will take something like 1 hour to answer. You just copy pasted the image of the question along with the solution in most of your posts.

Mew

@Doraemonドラえもん yes 100% agree

user246160

It is really disrespectful to expect people to answer your questions when all you do is insert an image of your problem.

user246160

And say "I don't understand the solution"

Mew

yeah exactly

user246160

9:17 AM

Such things are okay in the chat room but not on the main site

Mew

if you don't understand this solution, and we don't know why, then how do we know if you'll understand our solution

user246160

I hope you understand

user246160

And this is not a personal attack on you. I like your questions a lot. But I would request you to improve your way of asking questions.

koolman

@Doraemonドラえもん but sammy is ready to answer such ques

user246160

Seems like all my efforts in explaining you went in vain. Sad.

user246160

9:34 AM

In that case you should ask questions to Sammy personally via chat or personal message and not on a public Q and A site. Maybe Sammy has a lot of patience or free time to answer such questions or he is just doing it out of generosity. But not everyone is Sammy.

Secret

11:56 AM

[Old news]

mic.com/articles/91091/…

Can Silence Actually Drive You Crazy?

►

Silence is like being immersed into nothing, whatever that means

For me walking into a sound proof room is like suddenly being surrounded by something as if you dive into pillows, except no pillows are in sight

heather

12:14 PM

hello everyone

koolman

Hii

Secret

[Logic bomb philosophy]
1. What if Nothing exists?
2. what if nothing exists?
3. What if nothing exists, not even Nothing?
4. What if nothing exists, not even nothing?
5. Nothing exists, not even nothing
6. Nothing exists, even nothing does not exist
7. Nothing exists, even Nothing does not exist

John Rennie

@Doraemonドラえもん I watched the video and I found I agreed with everything Dr. Tharoor had to say. NB it wasn't a speech to Parliament though, it was the University of Oxford debating society.

heather

@Mew, i went through your whole conversation, esp after I saw the comment on the reopened questions. Thank you for doing that, for reference, I don't know if you can access my private conversation with koolman (using the private messaging system); but that was used. I'm not sure how well this is going to turn out. I might make a meta post addressing the overarching problem.

Jim

12:42 PM

@SirCumference also, @JohnRennie might want insight into this conversation: He can't be talking about a cosmo const balancing matter/radiation and "countering the expansion". No amount of matter/radiation can bring expansion to a stop. The relations between rate of expansion and the gravitational potential of both matter and radiation are both a power of $\frac{1}{a}$, which means they can decelerate the expansion, but that deceleration is asymptotic to $\dot a=0$

Only curvature has the capability to bring expansion to a halt. If it does, then yes, it can make an unstable state where any change in $a$ will make it continue in that direction. Take a look at this answer of mine:

3

A: Do photons make the universe expand?

Your initial thought process is flawless; in a radiation dominated universe, $a\propto\sqrt t$. That said, it is not correct to interpret this as the photons exerting some sort of pressure that drives the expansion. In modern FRW cosmology, a positive pressure ($\frac{1}{3}\rho_{rad}$ as you poin...

In the graph, you can see how $\dot a$ relates to the potential energy of each influence. Curvature shifts the entire graph. If there is just the right amount of curvature, you can find the $\dot a^2=0$ axis is tangent to the curve, at which point the universe stops and will expand forever if anything nudges it larger and will contract if anything nudges it smaller

If curvature shifts it too far, then aside from an imaginary expansion rate, which makes no sense, it can only contract. If it shifts not enough or in the other direction, it can only expand

heather

@JohnRennie at least you can take consolation in the fact that you have real adoring fans, and your not-so-adoring fans are funny. =)

user246160

1:00 PM

@JohnRennie Oh yeah, I just realized it today. Actually one of my friends showed me the video and said it was in the British Parliament. And there was no more details given about the place in the video, so I somehow believed him. No idea why he told me that it was in the British Parliament :P

user246160

Doing a bit of Googling indeed shows that it took place in the Oxford University :)...It was a misconception on my part, and sorry for that :)

user246160

1:19 PM

P.S:I just learnt that Oxford Union is a member of Oxford University and not a part of it :P

user246160

Oxford Union

The Oxford Union Society, commonly referred to simply as the Oxford Union, is a debating society in the city of Oxford, England, whose membership is drawn primarily from the University of Oxford. Founded in 1823, it is Britain's third oldest University Union (after the University of St Andrews Union Debating Society and The Cambridge Union), and has provided an opportunity for many budding politicians from Britain and other countries to develop their debating skills and to acquire a reputation and contacts. == Status and membership == The Oxford Union is an unincorporated association, holding its...

John Rennie

1:30 PM

@Jim Keep up at the back there Jim. I'm talking about a cosmological constant balancing out the contraction.

Jim

@JohnRennie Ah I now see that the conversation kind of digressed a bit from where it began

@SirCumference check out the graph in the link I posted. Whenever I need to conceptually think about the rate of expansion, I usually think about that graph

$V=-\frac{\dot a^2}{2}$, and $\dot a^2=(aH)^2$ and $\frac{1}{aH}$ is the Hubble horizon, which basically can be used to indicate what regions can be in causal contact. The graph says a lot more than what it seems to

@JohnRennie How big of an ego do you think I have that I can get my head around the entire universe?

Wait, don't answer that question

Secret

1:48 PM

madore.org/~david/math/hydra.xhtml

from MSE

Sanya

2:31 PM

0

A: Why doesn't photoelectric current increase with frequency of the incident wave?

We have been taught correct Which is similar to what Mr Griscom said ; that no. Of electrons ejecting doesn't changes when freq. Increased BUT WHEN FREQUENCY INCREASES ,ENERGY OF ELECTRON INCREASES . VELOCITY INC. ,TIME DEC. THUS CURRENT SHOULD INC BUT v=3×10^8 m/s and deccrement of a little tim...

how would all of you deal with this? Do you think there is more that needs to be done than commenting?

Secret

3:05 PM

I think he is basically saying that the current has a fixed velocity, which is why the photocurrent is unaffected by the frequency

user129412

3:20 PM

Anyone have a suggestion as to how I can improve my question a bit to help potential responders? physics.stackexchange.com/questions/297587/…

DanielSank

Hi, everybody.

@user129412 I read the question. It's in my field of expertise. However, it's pretty broad

You're asking "what happens". It would be easier to answer if you could indicate what effect you care about.

Also, this isn't a quantum problem at all.

You're just asking about a frequency modulated oscillator.

John Rennie

@Jim :-)

DanielSank

That's the same as an FM radio.

It's not quantum because there are no non-commuting operators.

user129412

3:39 PM

@DanielSank Maybe you're right. I figured because its phrased in the language of two level systems and such, and based on a superconducting qubit, that it would be more suitable for people familiar with those concepts. But I will try to make it more specific. What I care about is to what extent we see the same effect as with a coherent tone, and what is different, in terms of the sidebands.

DHMO

time flows so fast

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