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  1. Online From Galileo To Lorentz... And Beyond: Principles Of A Fundamental Theory Of Space And Time
  2. Online From Galileo To Lorentz And Beyond: Principles Of A Fundamental Theory Of Space And Time
  3. Book From Galileo To Lorentz And Beyond Principles Of A Fundamental Theory Of Space And Time
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Online From Galileo To Lorentz... And Beyond: Principles Of A Fundamental Theory Of Space And Time

It is the biggest contradiction in science. A can be less, more or equal to unity. It can be understood in analogous way as ……ground floor of the 10 storeyed building is demolished. Then its heavier mass or actual mass must be taken in account. However in nuclear chain reaction the velocity of neutrons is in relativistic region, so its mass must increase.

Online From Galileo To Lorentz And Beyond: Principles Of A Fundamental Theory Of Space And Time

But mass is taken as original mass. It is not justifies. From Natural Philosophy Wiki. Jump to: navigation , search.

Categories : Relativity Cosmology Philosophy. Your two values for the speed of the ball will be different; both correct for your frames of reference. Replace the ball with light and this calculation goes awry. If the person on the train were shining a light at the opposite wall and measured the speed of the particles of light photons , you and the passenger would both find that the photons had the same speed at all times.

Book From Galileo To Lorentz And Beyond Principles Of A Fundamental Theory Of Space And Time

In all cases, the speed of the photons would stay at just under , kilometres per second, as Maxwell's equations say they should. Einstein took this idea — the invariance of the speed of light — as one of his two postulates for the special theory of relativity. The other postulate was that the laws of physics are the same wherever you are, whether on an plane or standing on a country road.

But to keep the speed of light constant at all times and for all observers, in special relativity, space and time become stretchy and variable.


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Time is not absolute, for example. A moving clock ticks more slowly than a stationary one. Travel at the speed of light and, theoretically, the clock would stop altogether. How much the time dilates can be calculated by the two equations above. In our example above, this would be the person in the train.

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In this expression, c is a constant equal to the speed of light in a vacuum. The length of moving objects also shrink in the direction in which they move. Get to the speed of light not really possible, but imagine if you could for a moment and the object's length would shrink to zero.

Special Relativity Part 1: From Galileo to Einstein

The contracted length of a moving object relative to a stationary one can be calculated by dividing the proper length by the Lorentz factor — if it were possible for an object to reach the speed of light its length would shrink to zero. It is important to note that if you were the person moving faster and faster, you would not notice anything: time would tick normally for you and you would not be squashed in length.


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  6. But anyone watching you from the celestial station platform would be able to measure the differences, as calculated from the Lorentz factor. However, for everyday objects and everyday speeds, the Lorentz factor will be close to 1 — it is only at speeds close to that of light that the relativistic effects need serious attention.

    Another feature that emerges from special relativity is that, as something speeds up, its mass increases compared with its mass at rest, with the mass of the moving object determined by multiplying its rest mass by the Lorentz factor.

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    This increase in relativistic mass makes every extra unit of energy you put into speeding up the object less effective at making it actually move faster. As the speed of the object increases and starts to reach appreciable fractions of the speed of light c , the portion of energy going into making the object more massive gets bigger and bigger.

    This explains why nothing can travel faster than light — at or near light speed, any extra energy you put into an object does not make it move faster but just increases its mass. Mass and energy are the same thing — this is a profoundly important result. But that is another story. Topics Albert Einstein A short history of equations.