Recent content by effed3

We need to supply energy (from a battery) to a refrigerator in a room to have a decrease of entropy (inside refrigerator cool, outside warm). the refrigerator is a open system, and it's temperature reach a constant value, so it's entropy. Entropy of the refrigerator+room (closed sustem)...

You can consider the force (action) and the opposite only considering the whole system, car and earth. The two forces give zero sum for the whole system. At steering Earth will counter rotate, (if perfectly rigid body), but i will not even try to measure how much. In reality Earth will counter...

Because the (single) atom will not care of the angle in/out of the photon (roughly speaking). the atom(single) will diffuse the photon, as you imagine. And to get the things worst, if you look at the mirror -very- close you will find it not flat at all at microscopic level, even the flattest...

If we have a random cloud of -static- particles (the same will happen with random moving particles), subject only to self-gravity, the collapse will never be perfect or ideal, (all particles direct to the center of gravity CG). Due to the disomogeneities in the distribution the particles will...

The light is a part of the full energy generated by fusion in the core of the Sun, this energy will travel first mainly by transmission (radiation), photons (energy) travel atom to atom, and "heated" atom bounch others atoms, spreading and trasmitting theirs energy. (like the heat inside a...

I think yes, it's related to the darker limb of sun, the non uniform luminance at the edge is the same factor is as here. (But thinkong better it's not a convolution as i wrote..) Leonardo report this effect when standing in the light of sun in the frame of a open window, giving the back to...

On the name I'm not sure, "bulging of contact shadows"? i remember the first (?) account of this phenomenon is from Leonardo Da Vinci. The effect is related to the dimension of the light source, not point-like, but extended. So the shadows are blurred and not sharp. Getting closer the two...