Benjamin Franz

287 reputation

bio	website	snowhare.com
	location
	age
visits	member for	1 year, 10 months
	seen	Mar 26 at 15:19
stats	profile views	46

	287 reputation	bio	website	snowhare.com	visits	member for	1 year, 10 months
17 badges		location			seen	Mar 26 at 15:19

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Feb 27	comment	Equivalence principle and radiation from falling particle Here is a Java applet that helps visualize what happens when a charge accelerates. Play around with it and it will help.
Feb 26	comment	Equivalence principle and radiation from falling particle Don't think about it from an energetic argument. Think about it from the perspectives of what the time evolution of the electric field looks like in the co-moving frame of reference and then from the laboratory frame of reference.
Feb 26	accepted	Frequency of nomad planets passing within 30 AU of the sun
Feb 26	revised	Frequency of nomad planets passing within 30 AU of the sun LaTex not rendering again, attempt to clean up
Feb 25	comment	Keeping air in a well This is equivalent to constructing a shell around a planet at some arbitrary altitude. The pressure at the bottom of your hole will remain steady as long as the air pressure at the top is the same as the 'natural' pressure for that altitude.By which I mean if you start with some global specific (low) pressure at the top before you start digging, the pressure at the bottom of the hole will simply be the pressure you would get if the atmosphere was as much thicker as your hole is deep.
Feb 25	asked	Frequency of nomad planets passing within 30 AU of the sun
Feb 25	answered	Eliminating IR light reflection perceived by a steep viewing angle
Feb 16	comment	Why does a window become a mirror at night? The adjustment of pupil size is only a small part of the story (it accounts for perhaps a factor of 10 in the overall sensitivity). The eye actually becomes more and less sensitive by a much larger factor via other mechanisms. It is more akin to turning up and down the gain of the retina itself.
Feb 2	answered	What are the practical applications of decoherence?
Jan 30	comment	What is the difference between a Rodin coil and a Rodin starship? As Alexander said - it's a regular electromagnet. If you backtrack to find the background on Mr Rodin and his 'Rodin coil', you will find he is a classic case of a physics kook.
Jan 29	awarded	Scholar
Jan 29	accepted	Why does electron-positron annihilation prefer to emit photons?
Jan 29	awarded	Supporter
Jan 29	awarded	Editor
Jan 29	revised	Why does electron-positron annihilation prefer to emit photons? added 85 characters in body
Jan 29	comment	Why does electron-positron annihilation prefer to emit photons? Yes..but that doesn't actually answer my question. In the low energy limit why are photon pairs preferred over gravitons or neutrinos?
Jan 29	awarded	Student
Jan 29	asked	Why does electron-positron annihilation prefer to emit photons?
Jan 28	answered	What un-ionizes an electron after the photo-electric effect?
Jul 5	comment	maximum rotational speed A nice explanation can be found on pages 16 and 17 of this article by M. Camernzind and A. Muller. In essence, it is the speed that the black hole frame drags. It can't exceed the speed of light at the event horizon or you would no longer have an event horizon.