367 reputation
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bio website snowhare.com
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visits member for 3 years, 3 months
seen Sep 22 '13 at 16:25

Nov
4
awarded  Popular Question
Sep
22
answered How to argue that time travel to past would not be possible even in future?
Jun
10
comment Could a coronal mass ejection be responsible for this?
The sensor probably does interface with grid power. A sensor has to connect to the equipment it is being used for so there is very probably an electrical connection and it is probably actually powered by the equipment it is connected to. Sensors usually aren't self powered.
Jun
10
answered Could a coronal mass ejection be responsible for this?
Mar
5
answered Is it (theoretically) physically possible to project an image into thin air?
Jan
30
accepted Could an ultra-relativistic particle tunnel directly through a stellar mass black hole?
Jan
30
comment Could an ultra-relativistic particle tunnel directly through a stellar mass black hole?
I'm not sure we aren't talking past each other. My question is about the quantum mechanical possibility of the particle quantum tunnelling 'past' the barrier posed by black hole without ever actually 'entering' it (ala the Klein Paradox). I'm happy either way - I just want a clear explanation of why it can or cannot.
Jan
29
comment Could an ultra-relativistic particle tunnel directly through a stellar mass black hole?
I'm not getting why the cross-sectional area of the horizon matters. We are talking about the probability of the particle tunnelling through a thin potential barrier. The size of the barrier in the directions perpendicular to the direction of motion would seem to be irrelevant. To put it another way - if I were to replace the black hole with a normal matter wall, how would that differ for the question of tunnelling a ultra-relativistic particle through it?
Jan
29
asked Could an ultra-relativistic particle tunnel directly through a stellar mass black hole?
Oct
24
answered Why are photons released from high-voltage electricity through a near vacuum?
Oct
23
comment Why are photons released from high-voltage electricity through a near vacuum?
What actual example of photons being generated in a vacuum by high-voltage electricity are you thinking of?
Jul
3
awarded  Yearling
May
12
awarded  Tumbleweed
May
5
revised Temperature of the CMB when the Earth formed and the faint young Sun paradox
Explaining why the idea doesn't work
May
5
asked Temperature of the CMB when the Earth formed and the faint young Sun paradox
Apr
25
answered Can you use a wormhole to travel through space not time?
Apr
14
comment Will a hole cut into a metal disk expand or shrink when the disc is heated?
Here is a way to think about it that makes the answer obvious. Replace 'cut a hole into with 'draw a circle on' and consider what happens to the drawn circle when the disc is heated.
Apr
10
comment Is there a named unit that, when divided by 32, gives meters per second?
It sounds like someone got a meters to feet conversion backwards. 10 meters is about 32.8 feet. Also, are you getting meters per second (velocity) or meters per second squared (acceleration)? 1 g is about 9.8 meters/(secsec) or 32.1 feet/(secsec). Another context where 32 shows up is in atmospheres of pressure. You get about 1 atmosphere of pressure for a water column 32 feet deep. Context would help a lot in guessing why 32 is showing up.
Apr
6
comment Why does a coin falls faster when it's flipping as well?
To extend on my remark about the difference in the fall distance of the center of mass: A difference of only 1.1 millimeters in the fall distance would change the fall time by 15 milliseconds. That is on the order of the thickness of a typical small coin.
Apr
6
awarded  Commentator