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Light Speed

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16 years ago
Posts: 2038

@silencer
I suppose I have some problem to translate back some of these scientific terms in my language and I misunderstood the term "closing speed" (all my knowledge of the "physical english" came from watching "The big bang theory" in original language, so bear with me 🤣 ). And I admit you're right. I was still thinking of the plane example because I thought your post and the one from Calibre were from the same person. I apologize for my mistake.

But

Quote from silencer

  1. Anything comes toward you at nearly the speed of light and you measure its apparent speed without taking into account the diminishing time it takes light to reach you from the object."we attained it, a speed faster than light, yay " o_o

We didn't attain anything. Yours is a mere periphrasis. It's like to say that I can attain a temperature below the absolute zero with a negative temperature. But a negative temperature is hotter than the absolute zero. 😮


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The last Blood Elf
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16 years ago
Posts: 200

Ha ha,obviously the 4th case is just for fun. And you know, it was one of my exercise in highschool called "Apparent Superluminal Velocity of Galaxies".

yeah,the "The Big Bang theory" Tv show is funny as hell, i just watched some episodes


... Last edited by silencer 16 years ago
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16 years ago
Posts: 8

We will not attain the speed of light any more than we will abolish gravity. However, we may find "short-cuts" in the universe.


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Is a female
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16 years ago
Posts: 3457

You know, I don't think i'll be alive to see it, but I recon human race will probably reach speed of light. Maybe not an actual human to travel at the speed of light, but a machine of somesort probably.


Post #318145 - Reply To (#316734) by reid1
Post #318145 - Reply To (#316734) by reid1
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Madman
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16 years ago
Posts: 3342

[img]

Quote from reid1

Quote from Calíbre

I'll put it this way.
If we move 3/4 the speed of light, and the plane we are moving on moving 3/4 the speef of light in the same direction, we are then moving faster than light. Therefore, in relative sense moving faster than light may already have been acheived.

That's definitely false.

The formula you have to apply is: [img]http://upload.wikimedia.org/math/c/a/e/caefbb6379bd863dc286a87321d0dc78.png[/img]

In your example the result is that in relative sense we are moving at 24/25 the speed of light.

I hope you read through you whole source.

It clearly states "Einstein velocity addition is commutative only when v and u are parallel." I stated that both objects are moving in the same direction (i.e.) parallel.

Therefore the equation would be communative. [img]http://upload.wikimedia.org/math/c/a/f/caf0508d64d8dc8e697598545fe5c209.png[/img]

This is coming from your own source. http://en.wikipedia.org/wiki/Special_relativity#Composition_of_velocities

I could do the math, but I've realized that proving myself correct isn't going to get me a nobel prize. Lets just keep it at theories.


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16 years ago
Posts: 137

Well i know that sooner or later, the human race will be able to obtain traveling at the speed of light, just i think it wouldn't happen in our life time but maybe soon after.


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16 years ago
Posts: 930

Nothing is impossible: it only takes more time.


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I need a die with 2 sides.

That's known as a "coin".

Oh, thanks. Too much D&D.

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16 years ago
Posts: 963

i think its possible
but i think there would be crazy effects
like you'd move so fast that your body would burn into flames
or that somehow it would damage the enviroment
the way the earth moves possibly
i think we should test it out of hedgehogs
preferably blue ones 😛


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Post #318160 - Reply To (#318145) by Calíbre
Post #318160 - Reply To (#318145) by Calíbre
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16 years ago
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Quote from Calíbre

I hope you read through you whole source.

It clearly states "Einstein velocity addition is commutative only when v and u are parallel." I stated that both objects are moving in the same direction (i.e.) parallel.

Therefore the equation would be communative. [img]http://upload.wikimedia.org/math/c/a/f/caf0508d64d8dc8e697598545fe5c209.png[/img]

This is coming from your own source. http://en.wikipedia.org/wiki/Special_relativity#Composition_of_velocities

I could do the math, but I've realized that proving myself correct isn't going to get me a nobel prize. Lets just keep it at theories.

Yes in fact "Einstein velocity addition is commutative only when v and u are parallel." means that we can use my formula
[img]http://upload.wikimedia.org/math/c/a/e/caefbb6379bd863dc286a87321d0dc78.png[/img]

only if the two speeds are parallel.

When the speeds are not parallel we need to apply a gyrovector like in the post you made. It's explained better here http://en.wikipedia.org/wiki/Gyrovector_space#Einstein_velocity_addition

A similar example of your situation is here: http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/einvel2.html#c2
where the conclusion states that "The Einstein velocity addition gaurantees that the resultant velocity does not exceed c, even if all three of the indicated velocities approach c!"
As you can see we have to apply the same formula I posted before.


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16 years ago
Posts: 3380

I somehow doubt it.
At least in my lifetime...


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Post #318312 - Reply To (#318145) by Calíbre
Post #318312 - Reply To (#318145) by Calíbre
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The last Blood Elf
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16 years ago
Posts: 200

Quote from Calíbre

Therefore the equation would be communative. [img]http://upload.wikimedia.org/math/c/a/f/caf0508d64d8dc8e697598545fe5c209.png[/img]

This is coming from your own source. http://en.wikipedia.org/wiki/Special_relativity#Composition_of_velocities

I could do the math, but I've realized that proving myself correct isn't going to get me a nobel prize. Lets just keep it at theories.

Yeah, commutative here implies the symmetry of the formula...

Though i m sure you will really get a nobel prize if you can prove yourself correct in this case 😀

Wah , look at the poll .... lets keep our dream, 34.3% 🤣


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