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comment What's the escape velocity of Naked Singularities?
Imaginary escape velocity simply means that particles placed there will shoot outward to infinity (an another universe, perhaps?). The RN singularity is REPULSIVE. That being said, anything within the inner horizon isn't thought to be RN geometry, as "mass inflation" results.
Nov
17
comment Is it possible to increase temperature of sun using radiation of sun itself?
@Rob: True, a whole sun coverage would puff up and cool off. The asker was thinking to do it on a small scale, more like wrapping a finger in a thermal blanket.
Nov
16
comment Is it possible to increase temperature of sun using radiation of sun itself?
You cant concentrate infrared radiation in a room of constant temperature to heat up one portion (thermo 2nd law). HOWEVER, the sun's surface is NOT in a constant temperature environment, it gets heat from hotter regions below. The mirror will make it hotter, just like aliexpress.com/item/…
Nov
9
comment How would a black hole power plant work?
You have a nucleus-sized-everest-mass object that is emitting 300 megawatts. It's hard to push or pull that since anything coming close will get vaporized. You can't put much mass near it to pull it. You can't charge it since it will be emitting electrons or positrons and in this way can neutralize itself. Maby magnatic monopoles (too heavy to be emmited by hawking raiation and self-neutralize) lol.
Nov
9
comment How would a black hole power plant work?
It's hard to reflect gamma rays, and even harder to get them back into such a small target.
Oct
30
comment What would happen if Newton's Cradle was made of other geometrical objects rather than spheres?
Cubes are hard to make "ideal" collisions with, in practice objects will be sent spinning and tumbling, causing the whole system to be damped down much more quickly.
Oct
19
comment Can open, unsafe nuclear fusion reaction burn the atmosphere?
Isn't the solar core, with it's low power density, another argument against an out of control fusion event? Any fusion heat would quickly dissipate without a thick jacket to keep it hot.
Oct
18
comment Fusion plasma compression with liquid metal
General fusion should have mainstream, sound physics given the large investment in it. If it "fails" that would probably be due to engineering shortcommings and/or competition from a natural fusion reactor (cheap solar PV). The physics is the easy part, it should have been worked out by not.
Sep
24
comment Is it possible to create artificial gravity by magnetizing iron in the blood stream?
@Huge Allen: A frog would not float in a 10T human-size magnet because the dB/dx gradient would be less since the magnet is larger.
Aug
6
comment How can a metal heated at 600° emit thermal photons at 4000°+?
Our eyes are extremely sensitive to light, so 0.002% is still enough to see.
Jul
19
comment Has the photon both gravitational and inertial mass?
Which results are you talking about? The frequency IS related to the change in frequency. Time dilation is a relative number, i.e "twice as slow". If the original frequency is 1000Hz, the new frequency will be 500Hz. For 10000Hz it will be 5000 Hz.
Jul
19
comment Has the photon both gravitational and inertial mass?
No its not sci-fi, it is just a little confused.
Jul
18
comment Attractive higgs force and inflation
Thanks for the thorough answer, and the experimental results that show a GUT scale inflation.
Jul
10
comment Does kinetic friction increase as speed increases?
I meant to say the box's motion does not matter, since it is much slower than the particals.
Jun
29
comment Melting and Boiling Points of Odd Materials
Brick will melt, as it is mostly an aluminosilicate so will be a lot like glass. Complex organic compounds like cellulose in paper will decompose before melting/boiling.
Jun
26
comment How much does the Earth's rotation affect a golf ball?
@Padarom: Yes it would still affect it. The ground doesn't magically prevent the "Corellolis effect" from existing. However, the ground friction would partially counteract the effect by "dragging" the ball along with Earths rotation.
Jun
21
comment 1 Tesla electromagnet?
Materials saturate, meaning that the impressive B = 200000*knI hits a limiting B, above which the relative permeability drops off to 1, bringing us back to B = knI
Jun
21
comment Effect of humidity on static electricity
The main mechanism is probably the adsorption of atmospheric water molecules on surfaces, a function that depends on humidity. This water film, which may even mobilize ions, makes surfaces more conductive (NOT the air!). Like anti-static spray, this allows charges to dissipate.
May
5
comment Is it possible to create artificial gravity by magnetizing iron in the blood stream?
@Anixx: Yes that is a good way to put it. I just made the scaling laws more robust.
May
1
comment Magnetic field resistance material: are there any?
Ok thanks and welcome to Stack exchange!