Recent content by MeChaState

The rest-mass energy of a resting proton is about 938 MeV, from resting Electron 0.511 MeV. If you set them in motion the Kinetic Energy will add into it as JesseM explained. To compare, the energy of visible light is 2-3 eV. In LHC (Large Hadron Collider) they smash protons with an relative...

Hi Wahl, Would you be able to describe Wavelength Modulation too as you did very nice for FM? PS: FM: How can we in practice modulate the frequency of a LASER? Thanks David

I think this is not the right way of using the formula: E = (E’+p’*psi’*beta^2)/sqrt(1-beta^2) Where ever you got the second term from, for sure in the rest frame E' there is no division by sqrt(1-beta^2). the Energy-Momentum states: E^2(moving frame) = E'^2(rest frame) + c^2.p^2.

Hi, Where do you have this relationship? dQ' = (16*sigma'*T'^4*dpsi')/(3*c) It is saying that the change of heat in the BB is related to the change of volume? Thanks David

Sorry, I found my mistake, I didn't know how to delete the question! Thanks David

Hi, I have a question regarding the Electron scattering angel Teta in formula in: http://www.whfreeman.com/MODPHYSICS/PDF/3-2bw.pdf which indicates Compton wavelength shift by: labda2 - lamda1 = (h/mc)(1 - cos(Teta)). (3.40) With Teta = 0 we get labda2 = lamda1 (no change of energy by the...

Hi Pere, I was trying to understand the covariance function I came across your posting. I have been working in Fiber Optics Sensing. Could you please give me and practical example of "ARMA processes"? It looks to me very abstract. Tnx David

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Jeff let me please ask you in this way, if multiplication is just "shortcut to add up equal sized groups" it must be possible to express any equation with (x) into an equation with more or less (+)s. How would you express F = m x a n terms of addition only, without any multiplications? I know...

Lets take one of the cases, lets take the case (+2 gallons / minute) x (+3 minutes) = +6 gallons where we have the units (gallons / minute) x (minutes) resulting (gallons) which is fine and I can understand and is the "shortcut to add up equal sized groups". There are physical dimensions like...

Nabeshin In your example 2 has no dimension and it is an integer! But if you use L = V * t, it doesn't mean the same to me. To division: Isn't division the inversion of multipication? As far as I remember, in higher Algebra division a/b is defined as a x 1/b. Please forget the derivative, I...

multipication, dx/dt is a division which is define by a/b as a x 1/b. Thanks

Hi, I think I can relate the mathematical operation (+) to a physical entity. Let's say we know for mass it makes sense to say (m1) + (m2) = (m1 + m2) and that has an physical meaning. But what is the physics behind multiplication (x)? Let's say we accept a/b as a x 1/b and let's say we...

"I really don't know how to explain this physically. Help?" Has anyone an answer to this question? That is the question of my life too.

Hi Loren, Sorry for misunderstanding of what you want and sorry for the my limited english. Regarding the question of "nonconservative" system of couples springs, I think averaging over a period of oscillation can make it nonconservative. It is after my understanding always a question of...