Recent content by Salamon

I understand that the Quantum Hall Effect explains how both the transverse and longitudinal resistance vary with magnetic field strength. I don’t get why the hall resistance is equal to the hall voltage over the current . I know current isn’t a vector quantity but isn’t the hall resistance an...

Hello, I have a few questions about these images that I shared. 1) What does t represent? I am assuming Es is the energy of the atoms before they hybridize, and that t is either the gain or reduction of energy due to the new orbitals that are formed through bonding. Am I way off on this? 2)...

Thanks a lot Marcus for your response. I get what you wrote about time dilation but wouldn't the singularity or "bounce" be hidden from the outside observer since it lies beyond the event horizon? Also, is Rovelli saying that Hawking radiation doesn't exist at all?

I watched a lecture by Polchinski on youtube where he discussed firewalls that exist around black holes. He said explains that if information is not lost in a black hole then entanglements must be broken. Just as energy is released when chemical bonds are broken, energy is released when...

I have read Max Tegmark's book "The Mathematical Universe" and he describes this thing called The Measure Problem as the biggest problems in physics. I am having difficulty understanding the problem so I will try to sum up my understanding of what he said. As a result of inflation, the volume...

The equation for time dilation goes something like t' = t/ (√(1-v2/c2) I have heard that if a particle can travel at a speed such that v>c, then the particle will go backwards in time. But how is this true? According to this equation, if v>c, this implies that t' is an imaginary...

I wanted to know whether there exists any sort of theory which treats event horizons and cosmological horizons as equivalent. We can never receive any information from inside of a black hole because this would require an object moving faster than the speed of light to escape from the...

Assume that there exist two people, person A and person B. Person B is falling into a black hole. I understand that due to relativity and time dilation, person A will have to spend an infinite amount of time to watch person B cross the event horizon. Person B will appear to move at a slower...

So the horizontal acceleration of block 2 is less. They both have the same horizontal distance to travel. Therefore, block 1 strikes first. Correct?

Ok, well if Θ is with respect to the horizontal, then TcosΘ is the horizontal force on block 2 which is less than the horizontal force on block 1 which is T. Is that it?

TsinΘ?

A set or space is compact iff every open cover of the space has a finite subcover. Is everything that I said still true if the real line is a topological space which is topologized with the usual topology?

I know all closed intervals are compact. I am not sure why this is so. I am assuming [0,1] U [2,3] is compact but not connected? And (0,1) is not compact but is connected,right?

Homework Statement Two identical blocks are attached by a massless string running over a pulley. The rope initially runs over the pulley at the rope's midpoint, and the surface that block 1 rests on is frictionless. Blocks 1 and 2 are initially at rest when block 2 is released with the string...

Let's take the real line. I understand that there exists a subset of the real line which is connected and compact. Ex: [0,1] I understand that there exists a subset of the real line which is neither connected or compact. Ex: (0,1) U (5,6) Do there exist any subsets of the real line which...