Thank you very much JANUS, I have no objection. We can explain relativioty in class at the most simple term without using an equation .. by simple drawing..
There is another way to do it make the speed of light faster at the back end so that it catches the front flash at the same time.
But we will violate Einstein second principles:
The speed of light is a constant under any circumstances...
so that we sacrifice the length and time so correct...
If there is no length contraction how can you say the
"law of physics applies to all reference frame whether in the train or outside the train."
What shown in the demonstration your demo and my demo is show the mistakes of the classical physics ...that why there is special relativity...
We are correcting the observation of the observer in the middle of the train... without correction he saw first the flash at the front and later the back.. The observer outside the train see both occur at the same time..The law of physics must be equal to all inertia reference frame..You need...
http://www.youtube.com/watch?v=wteiuxyqtoM&feature=related
here is the background there is relativitic effect.lenght of contraction is a correction factor to make then strike simultaneously. this is observer on the train.
The inertial reference frame is the moving train at a velocity approaching light... because if train is moving at velocity of light light cannot catch the train time becomes infinity.. the observer cannot see the flash of light..
The length of contraction is an assumption to correct or make...
does time stops at the black hole? from the observer outside the horizon. He see the object falling in the event horizon as being converted to velocity of light and time become infinity right. Is time equal infinity equal to time stop in the common interpretation.
A lightning strikes the back and front of moving train v=c and the observer riding is in the middle of the train. He see thee light strikes first the front and later the back of the train. To correct this observation we should shortening the train equal to the length of contraction computed by...
Regarding the observer riding on the middle of the train sees the light strike first the fwd first and then the aft. Will it be safe to say that for the observer to see the light strikes them both at the same time to adjust the tail of the train by shortening the train so that light can arrive...
how does the ground gps receiver compute the distance of the user? Is it ratio and proportion of similar triangles? cosine law? linear algebra using matrices or gauss elimination?