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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!
Apr
30
comment Magnetic field resistance material: are there any?
If you like the answer please click the checkmark to "accept" it (you get 2 free rep when you accept answers). Speaker and hard disks magnets are shielded with a thick piece of steel or similar material, which act as a "conductor" of magnetic fields.
Apr
26
comment What does “optical conductivity” mean?
Maybe it is AC conductivity but at such a high frequency that instead of electronically generating an AC signal and measuring the conductivity you use light.
Apr
7
comment Calculating the most probable radius for an electron of a hydrogen atom in the ground state
We use area because we want the probability that r is exactly 0.1 nm (technically probability density), not the probability that r is less than 0.1 nm.
Apr
7
comment Thomson's jumping ring experiment
Yes the ring will move toward (be attracted to) the field when the flux drops, but the ring will tend to repel more than attract overall (the explanation is complex, however). See youtube.com/watch?v=dw73DcwIX-A for a similar example: you get more repulsion on average.
Apr
7
comment Thomson's jumping ring experiment
At 60Hz it will levitate in a relatively fixed place. The current is constantly changing. Each "pulse" causes a repulsion of the ring.
Apr
5
comment How can super massive black holes have a lower density than water?
The water pool would pack more mass into a similar size of space the our BH, so the whole thing collapses into one giant BH immediately.
Mar
21
comment Small object in air
Your drag equation assumes "inertial" drag, but "viscous drag" is more important at this tiny length scale. See en.wikipedia.org/wiki/Stokes'_law.
Mar
16
comment Primordial black hole: how dense does matter need to be to feed it?
The problem with a simple event-horizon-drain argument is that the accretion heat generated and/or the Hawking radiation would push matter away, counteracting the gravity. What rate of accretion before the heat generated produces a "bubble" that prevents other matter from entering? I don't know.