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Fixed Speed
why does light have a fixed speed?
is not light slowed down by gravity? can its speed be increased?
The fixed speed of light is an observation, that has held in all circumstances in which it has actually been checked (which is not to say it will always be true). Numerous experiments where conducted about the speed of light in the late 19th century, and the result was a puzzling constancy in speed. This was a big problem in theoretical physics around 1900. In Einstein's Theory of Relativity, the fixed speed of light is taken as an axiom, or prerequisite, of the theory.
In all of 20th century physics, the idea of a fixed speed of light was so successful, both experimentally and theoretically, that the idea that it might not be absolutely fixed was neglected.
As an aside, it needs to be pointed out that the apparent decrease in the speed of light in a non-vacuum medium is not of real theoretical significance---it is an approximation (and a really good one) used in optics. The photons do not really slow down in the medium, they are systematically absorbed and re-emitted so that they act exactly as if they were slowed down, and for experimental and engineering purposes, it is as if they were slowed down.
All that being said, it is possible that light does not have a totally fixed speed in vacuum in all circumstances. In a deep theoretical sense, it is not known why the speed of light has the value that it does. The speed of light is a connection between time and space that is taken to be immutable in all particle field theories, including string theory. But quantum gravity hints that the universiality of this connection may be somewhat bogus, or at least accidental, and possibly variable in very distant parts of the Universe (way beyond our event horizon). In some interesting speculative theories, such as "Doubly Special Relativity", photons that are extremely high energy can go faster than the cannonical speed of light.
Light is not slowed by gravity, it is redshifted to lower frequency. The photons coming out of a gravitational field lose energy, but they don't change their velocity.
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London Fixed Gear
Whats a nice comfy bike seat for a fixed speed bike?
i just bought a new fixie and the seat feels like its made out of rocks, know a really comfortable, not too ugly seat to replace it?
This one is the best.
Planet Bike Men's A.R.S. Anatomic Relief Bicycle Saddle
Product Features
* Planet Bike Men's A.R.S. Anatomic Relief Bicycle Saddle eliminates pain and numbness for any style of biking
* Sit-bone GEL pads relieve pressure from soft tissue
* Full-length center recess with hole offers anatomic relief and ventilation
* SuperSoft padding with a flex base offers maximum comfort and support
* With a durable, weatherproof cover
http://www.amazon.com/Planet-Bike-Anatomic-Relief-Bicycle/dp/B000C17L2W/?tag=knapaaai-20
For more
http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574865779&toolid=10001&campid=5336440665&customid=knapaaai&mpre=http%3a%2f%2fsporting-goods.shop.ebay.com%2fi.html%3f_nkw%3d%2bcomfy%2bbike%2bseat%26_sacat%3d382%26_odkw%3dwheels%2band%2btires%26_osacat%3d382%26_trksid%3dp3286.c0.m270.l1313
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