Recent content by mess1n

Hi, someone posted the following quote on facebook this morning, attributed to Albert Einstein: "Everything is energy and that’s all there is to it. Match the frequency of the reality you want and you cannot help but get that reality. It can be no other way. This is not philosophy. This is...

In the Schutz book, "A First Course in General Relativity" (bottom of p.42 if you have it), it states the following: For small v, the energy is: E = po = m(1-v2)-(1/2) =(approx) m + (1/2)mv2 I can't figure out why this is! For small v, the LHS will tend to m, and the RHS will tend to m, so...

In the first part of Brian Cox's documentary series 'Wonders of the Universe', he explains how the entropy of the universe always increases, and that we are therefore headed for a state of total 'disorder' where all is left of the universe is photons and dying black holes. But wasn't this...

Hey physicists! I'm having trouble getting my head around bra-ket algebra and was wondering if anyone knows any problems/worked solutions to help me understand it. Either that or some tutorial resources. Thanks, Andrew

Hi guys, I have a topic which I'm finding very tricky regarding the thermodynamics of dehydrogenation. Hopefully you can help me out! I have the following passage in my text which I'm finding it difficult to get my head around: What I think they're trying to say is: 1) If at RT...

Thanks so much for the reply, I'll read through those articles now.

Sorry to bump this, but I'm hoping someone sees it who will be able to help. Is this question in the right section?

I'm very confused about how metal hydrides form. I'm looking at PCI plots and I see what's happening, but I have no idea why it is. For instance: "Molecular hydrogen is dissociated at the surface before absorption; two H atoms recombine to H2 in the desorption process." Why does this...

Hey guys, I have a scenario where I can't figure out what would happen. If I have a magnetic sphere traveling down a track made of two conducting wires (each with current flowing through them)... what would happen? I'm not sure how the magnetic field of the wire and the magnetic field of...

I'm going over the continuity equation and I'm having some problems getting an intuitive grasp of probability current density. I can't get an idea of what it is. I know the equation, but I don't really know what it means. Could anyone help me out? Cheers, Andrew

So why can't I use the first constant instead of the second? Surely I've still constructed an orthogonal vector using the first method? Cheers, Andrew

Studiot: I only have one constant c1. It is obtained as lurflurf explained. Perhaps you're misunderstanding my question. I'm wondering why I can't use: "v2 = v1 + c1u2" INSTEAD OF: "v2 = u2 + c1v1"

Thanks for the responses. So I can use the second form of the equation? How comes I get wrong answers when I use it! Is it just a coincidence and I'm making a mistake with the numbers? It makes sense that the vectors would be different... but when I check if they're all orthogonal afterwards it...

Hey, I'm going over the Gram Schmidt method, and need some help understanding it. I understand that you're intending to create an orthogonal vector (i'll call them v) set based on a set of vectors you already have (i'll call them u). Then: Let v1 = u1 Now, construct the second orthogonal...

Hey, I've come across a part in my notes which I can't figure out. Essentially it says: \frac{\partial^{2}y}{\partial t^{2}} = v^{2} . \frac{\partial^{2}y}{\partial x^{2}} is space and time invariant. Whereas: \frac{\partial y}{\partial t} = -v . \frac{\partial y}{\partial x} is not...