Physics

So this star system is sapposed to be the best test for general relativity we have? How could this break the equivalency principle, what we we look for to see this? Side question - Why does general relativity break down at some point under quantum mechanics or not agree with quantum mechanize? i've been reading this claim alot. http://www.nature.com/news/massive-double-star-is-latest-test-for-einstein-s-gravity-theory-1.12880 http://www.wired.co.uk/news/archive/2014-01/06/triple-star-system

I am looking to build a "fire place" of sorts. I need to use a solid material around the heating unit/fire that can absorb heat and slowly radiate it for a long period of time. I know there are masonry heaters that does this well. They mostly use refactory bricks (fire bricks). Is there any other material that would be even better? Any particular stone, or stone composite that would be better? What about the possibility of manufacturing a stone composit with better properties than those already in ecistence?

Hi guys, I have two questions for you. 1- We understand electrons as popping in and out of existence in a field of possibilities, but is it also how we understand their behavior when they are not part of an atom? 2- Atoms can share electrons, but as they pop in and out of existence, and are never at the same place, how could they bind two atoms? ***sorry for spelling mistake of "behavior", looks like I can't edit the title. ***Looks like it's not a mistake after all, just not very American.

Galileo believed that things like color, texture, odor ect only exist in our consciousness and are created by our sensory organs. He also felt this applied to heat, as it doesn't exist but is merely felt. Are these beliefs still endorsed by the scientific community today or have they played a part in modern science?

If a gas like say H was heated with 200,000 Amps at 1.500,000 V and then the Psi was increased from 15 psi to 1.500,000 psi what would be the temp of the gas ? Thanks Pix

Hey guys. I just started a new blog about science and technology and my secon post is about the future of 3D printing. Would you tell me what you think about it? links removed Thanks.

is time simply a illusion?

Ok now this would be completely useless and inefficient in our atmosphere. Would it work if produce lift to have two arms rotating around a rod both going opposite directions to reduce effects of torsion. When spinning they would lengten on the top side and shorten on the bottom side. This would cause an inbalance where centrifigual force would pull upwards moreso than downwards..... in a vacumm could this produce more efficient propulsion than a rocket. An of course you cannot simply use props because there is no air to push against.... if this worked would it also seem to defy laws of physics?? What would be the opposite and equal reaction that creates this propulsion?

I have read that a single free neutron is unstable but then how a neutron star can exist ?

PLEASE, Help me out with this capacitance problem!!! I have been trying all my best to solve this question, most times, i end up in a dead lock and I leave it! I have just made a resolution to find the solution today. this is the original question; I redrew it and I had this; My problem is that there is a certain principle i think I should know in order to tackle that question, but i dont! any links to search?? We did the course last semester! how do I solve it? The question says I should find the effective capacitance. Thank You.

As the universe expandes is does not maintain a constant expansion speed, the expansion speed of the universe gets faster and faster. Spacetime itself is speeding up throughout the entire universe. Everything in the universe is speeding up. but we dont notice this so obviously, we can look at a clock and see that as usual time maintains a constant speed.... But Spacetime itself is widespread and affect all things in the universe. Is Spacetime Speeding up as the Universe Expands?

All Atomic Properties exist as waves.. But what is the First Wave that came into existence?

What is the meaning of earthing of any circuit ,I know its a child question . everybody says that it means 0 potential at that point but I didn't understand it till now I mean how current will be flowing after grounding in a circuit , what is the use of it in circuit other than 0 potential , how is circuit is completed after it ? Please help me

We all know that a proton binds to another proton through strong nuclear force but do also an electron binds to another , I haven't heard that there for asked ?

In special relativity, what is the equation for force?

Hello! How H-bonds effect on Raman spectra? Can we determine are there H-bonds in molecule with Raman spectra?

I have read that an electron and positron create two gamma photons after collision but is reverse also possible ?

The theory of everything is the most interesting research topic extending to almost all academic disciplines (arts or sciences), and to some; it is called the holy grail of science. Most interesting to me because when it is dicovered,it is expected to reconcile between logic, reason and natural phenomena which will provide a correct yardstick for future research and phenomena implementation. In philosophy(which is the grand parent of all sciences), even if you have all other answer to everything with out answering why- you can better go and dig your own grave. With phenomenology, reason without logic is daft. That is why Descartes found tough times w…

Everything that anyone knows about dark matter is just that it is there and it dose not react with anything it touches, goes near, or anything. But dark matter is present which is how galaxies are given the weight needed to rotate around each other and not fly apart. But, there is one thing that many people do neglect to look at even though it is right in front of their faces. Does anyone remember that trick where you leave a beer in the freezer for about 15 minuets and take it out, it is not frozen but if you knock it slightly on the bottom of the bottle the molecules will start to freeze from the bottom of the bottle up. Dark mater is present even though …

Why do two photons never collide I mean when two light rays intersect each other they do not form any resultant just passes each by ? Why and how ?

Is there some lower (or upper) limit to the wavelength of a photon. Like macrowaves or something?

For the purposes of a sci-fi story, what would be the effects of a large nearby electromagnetic pulse on a car, and what would it take to get it running properly again? Thanks in advance for any help

Hello, I saw this movie on youtube : "Free energy generator - Make ice cube with microwave oven " This film shows how it is possible, under certain conditions, to make a microwave oven work in a particular way to generate cold ! Is it really possible to make ice cube with microwave oven ? Thank you.

Hello everyone I'm making myself a new problem concerning kinematics, trajectory, ... And I'd like to know something: if a car with FWD jumps over a ramp: 1) Is it already following a parabolic 'trajectory' when the front wheels leave the ramp? Or only when the back wheels also don't touch the ramp anymore? 2) Can the car (theoretically) land on the ramp on the other side in that way, that the back wheels just make it on the second ramp? I know this might sound a bit awkward, but here's the problem: assume that the car will hit the second ramp with his front wheels at a point (x,y) as defined in y = y0 + xtan(theta) - gx²/(2v²cos²(theta), will it land in the …

Hello, Background: I was going to implement an implicit approach to 3d tetrahedra deformations (first in Matlab then in C++). I need the Jacobian for the partial derivative of force wrt position to do this. I found this paper that gives a method for computing it: http://www-bcf.usc.edu/~jbarbic/Barb...nessMatrix.pdf The Question: In the report, he defines a 2skew function (to the right of the page). I'm pretty confused on what it means. I think I forgot what skew means from linear algebra - that's probably part of my problem. It sounds like skew symmetric means that a negated matrix is equal to its transpose. What exactly is this 2skew function for?