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Thread: Relativity, please read

  1. #1 Relativity, please read 
    The Doctor Quantime's Avatar
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    Time travel is possible
    FTL speed is possible

    Here is a hint. There are more dimensions than what we can measure.


    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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  3. #2  
    Universal Mind John Galt's Avatar
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    SV I think you need to get down to the Boat House in Matlock for a beer and a pub meal. Your posts are becoming a little thin on substance.


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  4. #3  
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    Good point. Fresh air would be nice too :-D I actually posted this so that if Miomaz or the rest of them that do not fully understand relativity could retaliate against my statement if they wish, this post was all about extending the last FTL argument. Needless to say, I believe that they'll only fight me if I say they are wrong. Which if your reading you are!
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  5. #4  
    Forum Professor Obviously's Avatar
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    I have no belief that time travel is possible. :wink:
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  6. #5  
    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by svwillmer
    Good point. Fresh air would be nice too :-D I actually posted this so that if Miomaz or the rest of them that do not fully understand relativity could retaliate against my statement if they wish, this post was all about extending the last FTL argument. Needless to say, I believe that they'll only fight me if I say they are wrong. Which if your reading you are!
    Let's determine whether you fully understand Relativity first.


    Let's start with a couple of simple basic Relativity 101 exercises.

    1. Two spaceships are traveling at 0.99c with resepect to the Earth and in the same direction. One of the spaceships accelerates in the same direction as it is already traveling unitl it is moving at 0.5c relative to the other ship.

    What speed is it moving relative to the Earth?


    2. There are three asteroids (A,B & C) placed in a line and spaced 1 light sec apart as measured from any of the asteroids. Asteroid B is in the middle, and as result, an equal distance from Asteroids A and C.

    A Spaceship passes asteroid A at 0.866c heading in the direction of asteroids B & C. After the ship passes Asteroid A, both asteroid A and B explode. The timing of the explosions are such that the light from the explosions reach the spaceship at the same time and at the same instant as the spaceship passes asteroid B. By coincidence, at this moment clocks on both the spaceship and the asteroid read exactly 10:00:00.

    When did the explosions actually occur according to the Asteroid's clock, and when did they occur according to the spaceship's clock?
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  7. #6  
    Forum Ph.D.
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    an important concept of relativity, is the mass increase.
    as the speed reaches towards infinity, so does the mass.

    another concept of relativity:

    in relation to the universe, a ship traveling at near-light speed, is going to be
    flattened, from the universes point of view.
    BUT: from the spaceships point of view, the UNIVERSE is getting flattened,
    because the universe is traveling at near-light speeds.

    i wonder if FTL is possible, when breaking lightspeed if you'd enter an anti-universe created from the antimatter annihilated from our universe...
    pure speculation.
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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  8. #7  
    The Doctor Quantime's Avatar
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    Quote Originally Posted by Janus
    Quote Originally Posted by svwillmer
    Good point. Fresh air would be nice too :-D I actually posted this so that if Miomaz or the rest of them that do not fully understand relativity could retaliate against my statement if they wish, this post was all about extending the last FTL argument. Needless to say, I believe that they'll only fight me if I say they are wrong. Which if your reading you are!
    Let's determine whether you fully understand Relativity first.


    Let's start with a couple of simple basic Relativity 101 exercises.

    1. Two spaceships are traveling at 0.99c with resepect to the Earth and in the same direction. One of the spaceships accelerates in the same direction as it is already traveling unitl it is moving at 0.5c relative to the other ship.

    What speed is it moving relative to the Earth?


    2. There are three asteroids (A,B & C) placed in a line and spaced 1 light sec apart as measured from any of the asteroids. Asteroid B is in the middle, and as result, an equal distance from Asteroids A and C.

    A Spaceship passes asteroid A at 0.866c heading in the direction of asteroids B & C. After the ship passes Asteroid A, both asteroid A and B explode. The timing of the explosions are such that the light from the explosions reach the spaceship at the same time and at the same instant as the spaceship passes asteroid B. By coincidence, at this moment clocks on both the spaceship and the asteroid read exactly 10:00:00.

    When did the explosions actually occur according to the Asteroid's clock, and when did they occur according to the spaceship's clock?
    Look I'm not going to get into the Lorentz factor alright? I'm really not that bothered about telling you I understand. To be honest with you the first question was very vauge and you did not tell what you meant very well. When you said 'accelerate' did you mean that it has already accelerated or has begun to accelerate? Or do you mean it decelerates? (As in accelerates in the reverse relative direction?)

    I would think (without doing calculations) that the slowed down ship goes faster relative to the Earth than the other.

    Here since I can't be arsed:

    1/ /----- 1-v^2/c^2

    You substitute and stuff.

    (delta)t' = y(delta)t

    Where t' is the time that we measure using our clocks (say the Earth)
    Where t is the time taken on that spaceship moving at speed v relative to us.
    Where y is the Lorentz factor.

    Do you want me to go into relativistic mass? Momenergy? Length contraction? Describe the Michelson-Morley experiment? Describe Einsteins two postulates of SR? Distance, speed and the twin paradox? De-Broglie? E =mc^2? Explain electromagnetism using relativity? Principle of equivalence? Gravitational time dilation?

    Get the point? Good.

    Oh and the asteroids? Why didn't you quote the train and lightning? Same thing.
    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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  9. #8  
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    Quote Originally Posted by svwillmer
    Time travel is possible
    FTL speed is possible
    This is a bold claim, followed up by
    Here since I can't be arsed:
    1/ /----- 1-v^2/c^2

    You substitute and stuff.

    (delta)t' = y(delta)t
    What on earth can that gibberish mean? Have you any idea what you are talking about? If the forum rules didn't forbid it, I'd call you a idiot; your post is nonsensical.
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  10. #9  
    The Doctor Quantime's Avatar
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    Quote Originally Posted by Guitarist
    Quote Originally Posted by svwillmer
    Time travel is possible
    FTL speed is possible
    This is a bold claim, followed up by
    Here since I can't be arsed:
    1/ /----- 1-v^2/c^2

    You substitute and stuff.

    (delta)t' = y(delta)t
    What on earth can that gibberish mean? Have you any idea what you are talking about? If the forum rules didn't forbid it, I'd call you a idiot; your post is nonsensical.
    This /------- means the sqaure root, I apoligse for the unidentifiable way of putiting it but there was no way of putting the square root down that I thought of.

    Come on look at it. 1 divided by the sq. root of 1 minus the velocity squared divided by the speed of light squared.

    Delta is the triangle thing (third greek alphabet letter representing change in). Doesn't make sense? I hope you mean the way I put it down and not the meaning of it. Because the meaning of it could not be clearer. The Lorentz factor I have put down is the way of doing it differently.
    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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  11. #10  
    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by svwillmer
    Quote Originally Posted by Janus
    Quote Originally Posted by svwillmer
    Good point. Fresh air would be nice too :-D I actually posted this so that if Miomaz or the rest of them that do not fully understand relativity could retaliate against my statement if they wish, this post was all about extending the last FTL argument. Needless to say, I believe that they'll only fight me if I say they are wrong. Which if your reading you are!
    Let's determine whether you fully understand Relativity first.


    Let's start with a couple of simple basic Relativity 101 exercises.

    1. Two spaceships are traveling at 0.99c with resepect to the Earth and in the same direction. One of the spaceships accelerates in the same direction as it is already traveling unitl it is moving at 0.5c relative to the other ship.

    What speed is it moving relative to the Earth?


    2. There are three asteroids (A,B & C) placed in a line and spaced 1 light sec apart as measured from any of the asteroids. Asteroid B is in the middle, and as result, an equal distance from Asteroids A and C.

    A Spaceship passes asteroid A at 0.866c heading in the direction of asteroids B & C. After the ship passes Asteroid A, both asteroid A and B explode. The timing of the explosions are such that the light from the explosions reach the spaceship at the same time and at the same instant as the spaceship passes asteroid B. By coincidence, at this moment clocks on both the spaceship and the asteroid read exactly 10:00:00.

    When did the explosions actually occur according to the Asteroid's clock, and when did they occur according to the spaceship's clock?
    Look I'm not going to get into the Lorentz factor alright? I'm really not that bothered about telling you I understand. To be honest with you the first question was very vauge and you did not tell what you meant very well. When you said 'accelerate' did you mean that it has already accelerated or has begun to accelerate? Or do you mean it decelerates? (As in accelerates in the reverse relative direction?)
    What's vague about "accelerates in the same direction it is traveling until it is moving at .5c relative to the other ship"? But to clear things up, you start with two ships side by side, moving at .99c relative to the Earth. Now one ship speeds up until so that it is now moving such that he measures the relative velocity between his ship and the other ship as being .5c. (if he looks behind him he sees the other ship and is pulling away from that ship at .5c) At this point, what does he measure his velocity with respect tot he Earth as being?

    I would think (without doing calculations) that the slowed down ship goes faster relative to the Earth than the other.

    Here since I can't be arsed:

    1/ /----- 1-v^2/c^2

    You substitute and stuff.

    (delta)t' = y(delta)t

    Where t' is the time that we measure using our clocks (say the Earth)
    Where t is the time taken on that spaceship moving at speed v relative to us.
    Where y is the Lorentz factor.

    Do you want me to go into relativistic mass? Momenergy? Length contraction? Describe the Michelson-Morley experiment? Describe Einsteins two postulates of SR? Distance, speed and the twin paradox? De-Broglie? E =mc^2? Explain electromagnetism using relativity? Principle of equivalence? Gravitational time dilation?
    I want you to quit beating around the bush and answer the question. So far you haven't even given the relevant equation.

    Get the point? Good.
    So you familiar with some of the terms, you still haven't shown that you actually understand the principles behind them.

    Oh and the asteroids? Why didn't you quote the train and lightning? Same thing.
    Again, simply answer the question.



    Here's another:

    The surface gravity on Jupiter is 2.364g (with 1g being the surface gravity of the Earth)
    The surface gravity on Uranus is .889g

    If you place a clock on the surface of each of these planets, on which would the clock run slower than one on the surface of the Earth?
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  12. #11  
    The Doctor Quantime's Avatar
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    OK then I'll tell you what you want to hear, I don't know. There is that the answer you wanted? So now you've proved me wrong, feel free to show me the calculations to the first one and then the gravitational time dilation.
    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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  13. #12  
    The Doctor Quantime's Avatar
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    Td = /----1-r^2w^2/c^2

    Where Td = Td is the total time dilation
    Where r is the distance from the centre of the rotating object
    Where w is the angular velocity of the object

    This is for a rotating object.

    I'm not even going to get into the really complicated ones (you know why)

    Out of curiosity how old are you? PM me if you like.

    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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