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1d
comment Why is electrical energy so difficult to store?
@justin It seems that arizona falls power a hydroelectric generator. phoenix.gov/artssite/Documents/059524.pdf which energy is useful in the summer when demand is high for air conditioning. No electricity is stored. The water which falls has been transported there by natural ways, rain and rivers, at a high level and as the water falls it generates electricity hydroelectrically. Sun energy was input for clouds for rain to fall, so sunlight energy is stored in the pool above the fall, not electricity. One could in the summer using solar panels to get electricity directly from
1d
answered Arrangement of Nucleons due to Strong Force
1d
comment Are units of angle really dimensionless?
The second question is " don't they actually have dimension, or at least the properties of dimension?" and you are giving it a qualified "yes", not a "no", if "categories" are substituded for "dimension"
2d
awarded  Revival
2d
comment Gravitational wave contribution of the Hawking radiation from a black hole
@Ballistics let me repeat: black body radiation is a quantum mechanical phenomenon, it cannot be explained classically even for electromagnetic waves. Therefore gravitons are the game ( if they exist) with their spin two and the corresponding diagrams. Quadrupole gravitational radiation is built up by a confluence of gravitons from asymmetric masses, similar to the way that dipole is built up by a confluence of photons from an antenna, but that is another story. not black body which is quantum.
2d
revised Gravitational wave contribution of the Hawking radiation from a black hole
correction after comment
2d
comment Gravitational wave contribution of the Hawking radiation from a black hole
@ArnoldNeumaier I meant modeled of course. I will correct it.
2d
answered Can Gravity be used as an energy source?
2d
comment How can an electron fake a jet?
@Dar it is an underlying physical explanations but it depends on the wave functions of the possible hypothesis of the events, and that has a large number of variables. Hence monte carlos
2d
comment How can an electron fake a jet?
@DavidZ copying from pdf comes out in funny lines. The editor here fixes it, but the original is very unreadable so I prefer to give an image. I can leave the funny txt copy if you prefer . Also old papers which are images on pdf will become useless.
2d
comment How can an electron fake a jet?
@DavidZ I do not know this. Why? I give the references. should I incorporate a line with the link in the image?
2d
answered How can an electron fake a jet?
2d
comment How can an electron fake a jet?
can you give a link to one of these atlas papers? It is not clear in your formulation when and how the exclusion happens, is the event excluded from the sample of electron candidate events?The detector you show is CMS, which has a particularly good electromagnetic detector. Atlas's is not so greathttps: twiki.cern.ch/twiki/bin/view/AtlasPublic/…
2d
comment Can something without mass exert a force?
One should add that F=dp/dt for the argument to be complete
2d
revised Why engines don't melt?
correction after comments
2d
revised Why engines don't melt?
correction after comments
2d
comment Why engines don't melt?
@tfb correct. melts is a wrong term I guess, though it is the effect of too much heat.
2d
comment Why engines don't melt?
Micro boiling is the beginning of the steaming process next to the source of heat, the bottom of the pan in the kitchen, or the walls of the engine in the car. The water circulates fast enough so that it removes the 100C + tiny bubbles towards the refrigirator grid where air cools the water. people.smu.edu/ahumason/technotes/microboiling%20point.htm . all this is relevant to engineering designs.
2d
answered Why engines don't melt?
2d
revised Why do electron and hole mobilities decrease with temperature?
corrected mistake