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seen Jun 21 at 9:07

Jun
21
comment Biological heat dissipation methods
Summarized, if ground, air, and cloud cover have 38 degree and humidity is 100%, one will die.
Jun
21
comment Biological heat dissipation methods
If I get it right, all methods mentioned despite sweating require some matter that is colder than the body. For heat transfer to air, it has to be colder. For transfer by radiation, the visible environment has to be colder. This is actually the most likely one I consider, as with a clear sky, the environment partially consist of deep space, which is extremely cold, and the sun, which is extremely hot, but it's radiation is almost parallel and can be blocked easily. However, with humidities about 100% the sky would be more likely occluded. It would have a high temperature then too.
Jun
3
comment Gravity effect on moving bodies
So we can expect the change of gravity forces in one position depend on the change of their sources in a wave propagating manner, but the effect itself in one place is not affected by the speed of movement of a body in this field? So if I suddenly move the sun more far away from earth, earth would feel the change with about 8min delay. But if I move earth a bit, it would feel the change suddenly I guess. This insymmetry depends on the observer, once more, I guess, like if it is fixed to earth or sun.
May
17
comment Ocean surface mean current flow meaning
I don't think so, as there a hundreds of attractors each hundreds of kilometres in diameter. Filtering them out would result in a very rough picture that maybe would not be natural anymore. My guess is, that those attractors themselfes will move by a current on a larger scale on larger timescales. So the monthly mean may show attractors that would not exist on some-year time scales. Particles that would seem trapped by an attractor in a monthly mean may travel with it so they move in larger patterns over the years may hit a coast eventually.
Dec
11
comment Location of heat conversion in heat engines
But the equalized temperature would be lower, if compared to a system where there is no piston, and the temperature just equals out by itself?
Dec
11
comment Location of heat conversion in heat engines
Like it was taught in school, I thought that any energy becomes heat some time, and can not be converted to any other energy back. However, as you said, the total amount of heat may decrease. If the heat stored in a fire and the heat in it's environment are added, they come out for more heat, as if the heat of the fire funneled to a piston and the heat of the piston's environment is added, after the piston is moved. So concentrated heat seems more valuable than spread heat, and spreading heat may reduce the total amount of heat stored, if done well (by a moving piston).
Apr
1
comment Equal hourglass levels blindly
Sadly, this even won't work at all. There is less sand as one full bulb in total in the glass, so the level would equalize just until it drops below the passage in both bulbs.
Apr
1
comment Equal hourglass levels blindly
The shaking idea sounds plausible. However, trying it on a real hourglass revealed that the sand is quite stable in a certain position, thus it moves in short intervals and calms down inbetween. Using a strong vibration or constant quite agressive knocking on the glass would give the desired result it seems... but this is not so practical as it takes a long time of aggressive movement.
Nov
5
comment diesel steam engine
The question is more about if the engine could be driven by external heat instead internal combustion... It is part of the idea to heat up the cylinders by external combustion, by fuel, gas or wood...
Feb
17
comment maximum positive electric charge of solid body
What kind of setup could achieve that charges?
Aug
18
comment maximum positive electric charge of solid body
Are those $Vm^{-1}$ values theoretical ones or in reach for experimental techniques?
Aug
16
comment Density and statistical models for visible air dust
Yes, there are definitely 'large' particles involved, like dust and mist drops, which may be invisible to the bare eye, but are visible as single particles if illuminated brightly. So I think my question is not so much about the scattering details but more about the statistics of particles in the air, their size and their reflection ability (maybe just their 'color'?).
Apr
8
comment Trapping a lightray
I think the MathOverflow answer state that there is a solution for a trapped photon between surfaces, but no need for an 'entry hole' like we have here. If we have a hole, the beam cannot be trapped in a finite reflection cycle (it would hit the hole again) but must hit a new spot after every reflection. This however should be possible, if the locations in the alternating reflection sequence approach two limit points.
Apr
8
comment light ray 'entropy'
Thanks! If you post that as an answer, I will accept it. An addition: If I would use a solar cell and an electrical lightsource both highly effective, it should be possible to build the box. Is this possible becuase it's by non-optic means, or is there a deeper law that would limit the effectivenes of the cell or the source to impede this?