Recent content by 3nTr0pY

Great. Thanks again for your help.

Thanks for the help. I did what you said but without understanding why it works. Comparing it to the required result, I get something very similar but which requires equations such as the following to be true: vx2/v2 + fx2 + gx2 = 1 and -(vxvy)/v2 = fxfy + gxgy Why are these true? (And why...

I really like the 'photon clock' explanation. Imagine you have a photon clock which measures one second as the time it takes a photon to go up a distance d, bounce off a mirror and go back down a distance d. Now imagine you have this photon clock on a train moving at speed v. Relative to you...

Sorry for digging this thread up, but why does RBR-1 work? Is B the vx boost matrix? If so, why does it cause it go in the 'easiest direction' when it acts on the rotation matrix. I can see why you then have to do the inverse to go back to the original coordinate basis, but why is the...

Ok, I solved it using bog standard Lorentz transformations. As (annoyingly) easy as that.But I'm still really confused as to why I couldn't get the transformation I mentioned in my first post to work (the Lorentz boost). I don't really get how it works/what the point of it is, so any...

I was reading through my textbook and it said that the angle between the axes of two inertial frames, one stationary and one moving at velocity v is supposed to be tan^-1(v/c). I assumed this would be easy to show, but after spending a couple of hours on this probably trivial problem, I can't...

But how would you know that it is initially in eigenstate Jz? Surely in the general case, you have no knowledge of the initial eigenstate and so it acts as a superposition of all possible eigenstates? And then once an initial measurement is made such a superposition no longer exists. I've not...

Sorry, I'm referring to the Copenhagen interpretation here. Would my description of the Copenhagen interpretation be correct?

Would it be fair to say that before an observation, a wave-particle is in a superposition of many possible states but that after the observation, the wave-particle is found only in one state? Would that be analogous to saying that it goes from behaving in a very wave-like manner to behaving...

Im looking for a good website that explains topics in mechanics to high A level/first year University standard. Because currently I just get stuck on a question at Uni and I don't really know what to do to find the answer.