Recent content by gennarakis

Thanks a lot! You are right...I confused the electric charge with the spin of the particle and I couldn't see how three quarks with 2/3 and -1/3 spins cannot be integers...

I was confused for a second though I see my question is probably of lack of knowledge..but all bosons must have an integer spin, right? so, how baryons which are comprised of three quarks and hence have an integer spin are fermions and not bosons?

Hi there, I have a problem to solve in Cosmology which says: "Write the formulas for the quantum kinetic energy of neutrons, protons and electrons as well as the formula for the gravitational energy for a neutron star that is comprised of free neutrons, protons and electrons in a ratio of Nn ...

Hi! Great question! I had that question a few years ago and I had found the answer but can't remember it very well to explain you in full detail at the moment...but it has to do with the angular momentum of the wheels (and maybe the friction on the wheel) A wheel moving wants to keep moving due...

I'm not a black holes expert. Though, what I was trying to say is that you can't describe something you don't know anything about. Matter inside a black hole probably collapses or becomes into another form. No one will ever know until something is observed. Models help you look at he right...

All we know is that matter and all the laws of quantum physics -like the minimum quantum energy or the energy states- collapse. You can't have a periodic element inside a black hole. And I guess mass too, loses its properties as we know it from everyday interaction with it. To me black holes...

I think you perplex things too much. I thought this is a physics forum which requires answers to have a scientific reasoning...Thanks god here, most of the classical physics problems have a uni-vocal definition! First of all, there wouldn't be any linear speed of the bike if they were no...

This is an exams problem and you have a limited amount of time to solve it. I suppose there isn't an exact method to solve for these fractional exponents.. Can you give me a hint for Newton's method..

Homework Statement Knowing the Z (number of protons) of an element, how can I find N (number of neutrons) or A (mass number) of the element? Homework Equations I tried to use the semi-empirical mass formula EB = ανΑ - αsA2/3 - αcZ2/A1/3 - αΑ(Α-2Ζ)2/Α - δ(Α,Ζ) for this. The Attempt at a...

So the mass (and furthermore the density) can only be measured in a non relative frame of reference (as that of an accelerating one) otherwise you would never know the real mass of yours, hence the density.

If the density of an object increases in special relativity (as mass increases and volume decreases), wouldn't we see strange phenomena as skyrockets exploding (because some materials can't sustain to much pressure)??

Sorry as it seems I didn't use the exact average rule... http://upload.wikimedia.org/math/2/4/7/247a435e08fbaf845d6501ac1ca740a7.png Thanks!It was my first answer on PF and I have to say it was fast and easy...:)

I just integrated from 0 to 2Pi changed sin2θ=(1-cos2θ)/2 but the result is Pi and not 1/2...:confused:

How can <sin2θ>=1/2 and <cos2θ>=1/2 How is the proof made?Integrate sin2θ from -Infinity to +Infinity?

So exactly when in general does light show this particle-like behavior? In the double slit experiment one can see both the particle and wave nature of an electromagnetic wave...Read this... http://en.wikipedia.org/wiki/Double-slit_experiment and Watch this...