Energies Definition and 314 Threads

+2Q and -Q two pt charges are r apart. AS no external agent exists, they attract to each other and each gains +Q/2 after conduction. Like charges repel. At same distance at r, 2*k(2Q)(-Q)/r = 2*k(Q/2)sq /r + 2 KE... but what i want to know is that when is the like charges repel...just after a...

Why is QCD non-perturbative at low energies? In QCD isn't the expansion parameter the fine structure constant? \alpha_s \approx \frac{1}{137} Does this somehow depend on energy, which wouldn't make sense to me. I cannot seem to find a good answer anywhere, so I thought I would ask here...

Hello there fellow physicist, Well for my A2 investigation I have done Thermocouples. I investigated the potential difference produced by different metal combinations. Now I need a hypothesis of some sort. What property of a metal will influence the potential difference produced by a...

A simple question: A small truck and a large truck have the same kinetic energies. Which truck has the greater momentum? Justify your answer.

A neutron at rest in the laboratory spontaneously decays into a proton, an electron, and a small essentially massless particle called a neutrino. Calculate the kinetic energy of the proton and the electron in each of the following cases: a) the neutrino has no kinetic energy b) the neutrino...

Particle A, at rest, decays into three or more particles: P1, P2, ..., Pn. Determine the maximum and minimum energies that P1 can have in such a decay, in terms of various masses. My solution: First of all, the decay should not occur if the rest mass of A would be smaller than the sum...

How would three P orbitals, X,Y,Z, in the same subshell, give the electrons different quantum energies?

The following is from a book I'm reading: (With regard to uncertainty and vacuums) can someone explain what's going on there.

Suppose you have a rail with two springs on the sides, both with the same constant K. The length of the rail is L, and the length of each spring is D (when not contracted or elongated). On that rail you have an object of mass M (which may be treated as a point particle), and the coefficient of...

if two particles have equal kenetic energies, do they have the same momentum?

What are the approximate relative sizes of the following energies? a) The n = 1 to n = 2 energy difference in hydrogen and the rest mass mc^2 of an electron b) The n = 1 to n = 2 energy difference in hydrogen and a typical fine structure splitting in hydrogen c) A typical fine...

How do you go about calculating the ionization energies from atoms? Electron affinities? (KJ/mol) for example, "Calculate the change in energy from the first and fourth ionization energies of Be?" Recently on a test (CHEM AP HIGH SCHOOL), I had a question similar to this on an exam. I...

Some time back a friend (PhD Nuclear Engineer), told me that the energies a neutron needed to form C14 from nitrogen were (and this is where my memory gets real fuzzy) around 15 MEV. Furthermore that neither nuclear explosions or the Sun produced neutrons of this energy. The implications were...

I wasn't sure where to put this post, it's mostly theoretical. Lately, I've begun some research. Mostly about the mind- not the brain. I believe that we as humans have some outstanding quality that distinguishes us from animals... and it is our minds. I'm very young, by the way, but I've...