Physics

earth isnt so stupid as it looks like

Hi. Instead of flame powered, an electric heating element. How does it compare to a plain AC household electric refrigerator, say one that consumes 250 Watts x 16 hours every day. (4000 Watthour) A 250 watt heating element attached to an absorption refrigerator, would have a reasonable household performance ?

Found this article http://www.bbc.com/news/science-environment-28543990 There is also this article with heaps of math http://www.nature.com/ncomms/2014/140729/ncomms5492/full/ncomms5492.html About Schrodinger's cat Glimpsing this Cheshire Cat requires what quantum physicists call "weak measurement," whereby you interact with a system so gently that you avoid collapsing it from a quantum state to a classical one. Now according to Schrodinger's cat any measurement should collapse the quantum state.

Hi. When a turning wheel comes to rest, there is an apparent tiny backing of the motion. Is it apparent or real ? As in a turntable, a ceiling fan, or any horizontal turning mass when comes to a stop, gives the impression of reversing.

Hello! Does somebody performed experiment in which Chlorine gas has been separated to isotopes Chlorine-35 and Chlorine-37, and measured speed of sound independently per isotope.. ? Best Regards!

Here are the 2+1D gravitational Chern-Simons action of the connection [latex]\Gamma[/latex] or spin-connection: [latex]S=\int\Gamma\wedge\mathrm{d}\Gamma + \frac{2}{3}\Gamma\wedge\Gamma\wedge\Gamma \tag{1}[/latex] [latex]S=\int\omega\wedge\mathrm{d}\omega + \frac{2}{3}\omega\wedge\omega\wedge\omega \tag{2}[/latex] Usual Chern-Simons theory is said to be topological, since [latex]S=\int A\wedge\mathrm{d}A + \frac{2}{3}A\wedge A \wedge A[/latex] does not depend on the spacetime metric. (1) Are they topological or not? (2) Do they depend on the spacetime metric (the action including the integrand)? (3) Do we have topological gravitational Chern-Simons theory then…

Weinberg-Witten theorem states that massless particles (either composite or elementary) with spin [latex]j > 1/2[/latex] cannot carry a Lorentz-covariant current, while massless particles with spin [latex]j > 1[/latex] cannot carry a Lorentz-covariant stress-energy. The theorem is usually interpreted to mean that the graviton ([latex]j = 2[/latex]) cannot be a composite particle in a relativistic quantum field theory. While the argument is so strong and weird, how is it possible? Why can we not construct a theory which is massless charged vector field and therefore carry a Lorentz-covariant current ? And although we assume the second argument is right, which sa…

Hello, everyone. This will be my first post in these forums. I am a 23 years old student and I am starting my own business in the following 1-2 months. It will be an escape room. For those unfamiliar, here is a wiki page about this concept - http://en.wikipedia.org/wiki/Real-life_room_escape Essentially a group of persons (usually 2-4) enters a room (or1-3 room appartment) and they have to solve several intellectual, interesting and original tasks to get out of the room. Time limit is usually 60 minutes. I have thought of several tasks (such as finding coordinates where to put several mirrors, which when done correctly, redirect a laser beam, which opens a door to …

Do magnets (permanent) become weaker as they are exposed to para-magnetic objects? I was thinking about this after seeing this. I am buying a magnet and wish to know if a magnet (permanent) loses its magnetic domain structure or alignment when exposed to para magnetic materials.

I would think that snow boards are faster because they have a much larger over all surface area so the weight distribution would be a lot better so there would be less friction. this would be of cores a perfect run with the same steepness and no imperfection and it would not be groomed.

So, assuming you have all the tools to contain and test it, what would be the outcome be if you put some alpha particles in direct contact with microwaves? would there be any transformation to more stable particles like an ion of He?

Man taking this Physics class.. I'm just loving every intricacy. There is a beauty I seen in it like no other comparable , when I'm learning Kinematics for the first time and I realize how I can describe motion mathematically, or the fashion in which the concepts of physics interpret the universe for the way she is as abstract as she is in an patternistic, simple, and proportional manner. I love how we take impossibly complex problems and solve them by breaking them down into simple kinematics. I'm definitely in the right science. The discipline of physics is so magnificently beautiful.

Hi guys! I would appreciate your help for this short question. So I am building an escape room (more info in wiki - real life escape rooms) and I basically want to use polarizing lenses to hide a message. I would have a photo frame with a message in it and 2 layers of polarizing lenses on top of each other. in front of the message. I have been given to understand that by twisting the upper polarizing lense you can make the glass impossible to see though or vice verca if you twist the upper lense the other way. This effect is shown in this video. (at 1:50 minute mark) My question is this. Since I am a beginner in field of optics, what kind of lenses should I buy …

Is it possible to have a mercury plasma cooled down to the point it becomes a superconductor?

This is a quote from a NY Times article about slefhandicapping: Does anyone happen to know what exactly recent research has shown about who is prone to it? It isn't explained in the rest of the article. For those who may not know what selfhandicapping is, its a method of protecting your ego and selfesteem by producing an excuse for your performance on some test, like, suppose you were to have an IQ test scheduled, so you don't sleep the night before, or you get drunk the night before just so you can say that your score was negatively impacted. That's an example, but it can be any way of concocting a reason as to why the result of the test doesn't reflect on y…

. A Question about the Logic of the Law of Conservation of Energy with Demagnetized and Moving Magnets. There are two closed systems. In terms of energy each system is identical. In each system, there are two magnetically aligned ferromagnets. One is fixed in place, and the other one is in motion moving towards the fixed one due to their mutual attraction. In each system, there is a chemical heat pack. If the chemicals are exposed to one another thermal energy will be generated. The temperature in the vicinity of the heat pack after the chemical exposure will be greater than the Curie temperature of the ferromagnets. (And after that, …

Recently I watched a couple of fun YouTube videos on Klein bottles. In one of them https://youtu.be/4XN0V4xHaoQ the Mathologer, a math professor I think, talks about the mathematical possibility of a universe being shaped like a 3d counterpart of a 2d Klein bottle surface. That would mean that somebody living in such a universe could turn himself into his mirror image by travelling along certain closed paths. Is there anything in physics that would indicate that such mirror-reversing paths are or are not present in our universe?

Hey, I'm doing a assignment for school and the question is "does the density of a liquid affect refraction" Im using a glass jar with various liquids and a laser point as the light although no matter what liquid i use the light stays straight all the way thru and out the otherside. Am i doing something wrong or does the density not affect refraction

Hello, This is a very odd question that I was wondering if anyone could share some insight on. So I've been reading about the history of science lately in particular how Joseph John Thomson discovered the electron / cathode rays. The discription of the device(s) he used is that he basically had an evacuated glass tube (vacuum tube) with a spark gap in it, and if you apply a potential difference across that gap electrons are ejected out of the material comprising the spark gap creating a "cathode ray". This effect is enhanced if the metal comprising the spark gap is hot. My question is what would happen if the metal was instead cold, like extremely cold, to the poi…

I am currently working on Flooded VRLA battery. I applied a current profile on the battery in which its SOC moves from 50 % to 80 % SOC range in every cycle. Its a constant profile for 440 hours. But in every new cycle terminal voltage is increasing ( or we can say expanding in both upper and lower side ). Also if we notice the OCV after 30 mints of resting is increasing. Now i need to estimate the SOC of this profile. As the current is same in every cycle but OCV and terminal voltage is increasing , so SOC estimation is different for every next cycle while it should be same as current is same. I would be really thankful if someone help me by telling the reason of this ph…

My father who is a mechanical engineer seems to think that something cannot come from nothing but I think that he is wrong because my father evidently never heard of virtual particles and quantum field theory. Another thing my father believes is that mathematics doesn't really exist in nature but again I think he is wrong on that one because the evidence shows that mathematical relations and functions are an integral part of physics and that physics cannot really be done without the mathematics. So in other words mathematics is part of reality but my father who is not a physicist does not seem to grasp that.

Hello, **** At the beginning I would like to apologize everyone for my bad eglish. It's really hard for me to write about all this things in foreign language. But I will try For many years I was interested in physics, mainly lasers, high voltage and acoustics. I analyzed many possible combinations of use of this elements. I built dozens of lasers, high voltage generators, checked the behavior of lasers on the different conditions (eg. changing magnetic field, electrostatic voltage). One day I noticed the influence of acoustic waves on a UV laser beam. An acoustic wave with a frequency around 28-30 [Hz] has put a beam in vibrations. This effect was hardl…

http://imgur.com/kSBMz98 If you see in the picture above, there are 8 equations and I need help understanding how equations 7 and 8 were derived from equations 1 and 2. I believe all the information needed is available in the picture above but if anyone needs the link to the paper, I've linked it below. http://www.sciencedirect.com/science/article/pii/0020768375900141

Hello! I'm trying to think of a (relatively) simple way to explain this issue to someone. Don't worry, I'm not interested in "magic" talk about free will or anything of the sort, just a clarification of terms. Is it fear to break down the, completely hypothetical, "theory of everything" as so: 1. General Relativity is (seems to be?) determinate. 2. Quantum Mechanics is (seems to be?) indeterminate. The Uncertainty Principle means not only that we can't determine QM through observation, but that the system seems to be fundamentally indeterminate. 3. Einstein, to the end of his days, insisted that we're missing variables that would remove the apparent uncer…

If not then how to solve questions in which a wheat stone bridge like circuit is given with inductors in place of resistors or capacitors......like how to find equivalent inductance or current through it etc.... Please explain with an appropiate and detailed example(with pictures if possible ) Thanks Nah no need for examples sry