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Apr
27
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"
Apr
26
awarded  Revival
Apr
26
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.
Apr
26
revised Gravitational wave contribution of the Hawking radiation from a black hole
correction after comment
Apr
26
comment Gravitational wave contribution of the Hawking radiation from a black hole
@ArnoldNeumaier I meant modeled of course. I will correct it.
Apr
26
answered Can Gravity be used as an energy source?
Apr
26
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
Apr
26
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.
Apr
26
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?
Apr
26
answered How can an electron fake a jet?
Apr
26
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/…
Apr
26
comment Can something without mass exert a force?
One should add that F=dp/dt for the argument to be complete
Apr
26
revised Why engines don't melt?
correction after comments
Apr
26
revised Why engines don't melt?
correction after comments
Apr
26
comment Why engines don't melt?
@tfb correct. melts is a wrong term I guess, though it is the effect of too much heat.
Apr
26
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.
Apr
26
answered Why engines don't melt?
Apr
26
revised Why do electron and hole mobilities decrease with temperature?
corrected mistake
Apr
26
answered Why do electron and hole mobilities decrease with temperature?
Apr
25
comment Gravity vs Gravitational Waves
yes to your last two sentences.