Why do we have the principle of equivalence
fitz
or why is the gravitational force the same as an apparent
acceleration?
See: http://www.amperefitz.com/principle-of-equivalence.htm
Let me know what you think.
Th1...@Indiainfo.com
Y.Porat
> On 12/17/09 12:22 PM, fitz wrote:
>
> > Why do we have the principle of equivalence
>
> http://en.wikipedia.org/wiki/Equivalence_principle
> http://csep10.phys.utk.edu/astr162/lect/cosmology/equivalence.html
>
> General Relativity: the Principle of Equivalence
>
> One of the most important of these is the Principle of Equivalence, which can be used to
> derive important results without having to solve the full equations of General Relativity.
> There are several ways to formulate the Principle of Equivalence, but one of the simplest
> is Einstein's original insight: he suddenly realized, while sitting in his office in Bern,
> Switzerland, in 1907, that if he were to fall freely in a gravitational field (think of a
> sky diver before she opens her parachute, or an unfortunate elevator if its cable breaks),
> he would be unable to feel his own weight. Einstein later recounted that this realization
> was the "happiest moment in his life", for he understood that this idea was the key to how
> to extend the Special Theory of Relativity to include the effect of gravitation. We are
> used to seeing astrononauts in free fall as their spacecraft circles the Earth these days,
> but we should appreciate that in 1907 this was a rather remarkable insight.
>
> Importance of the Equivalence Principle
>
> An equivalent formulation of the Principle of Equivalence is that at any local (that is,
> sufficiently small) region in spacetime it is possible to formulate the equations
> governing physical laws such that the effect of gravitation can be neglected. This in turn
> means that the Special Theory of Relativity is valid for that particular situation, and
> this in turn allows a number of things to be deduced because the solution of the equations
> for the Special Theory of Relativity is beyond the scope of our course, but is not
> particularly difficult for those trained in the required mathematics.
> Consequences of the Principle of Equivalence
>
> For example, by considering the Principle of Equivalence applied to light travelling
> across a freely falling elevator, it is possible to conclude that light will follow a
> curved path in a gravitational field. See this discussion to understand how. Likewise, by
> considering light travelling upwards in an elevator in free fall, it is possible to
> conclude that light will be redshifted in a gravitational field.
-------------------
light can be red shifted
(and curved!) in a gravitational field
BECAUSE IT HAS MASS !!
no need for the other (pompous ) mumbling !!
Y.P
-------------------------------------
Aleph
b300d1...@p8g2000yqb.googlegroups.com>, sent to sci.physics on Tue,
22 Dec 2009 00:53:09 -0800 (PST), Y.Porat <y.y....@gmail.com> imparted
these words of wisdom:
>
> -------------------
> light can be red shifted
> (and curved!) in a gravitational field
> BECAUSE IT HAS MASS !!
>
> no need for the other (pompous ) mumbling !!
>
Prove it, dumbass. What is the mass of a photon? How much energy would
be required to move your photon at c? What would be the effect of that
much mass travelling at c hitting your body?
--
Aleph
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