Added: 3 years ago
From: Nidhogg05
Views: 28,138
Sort by time | Sort by thread (beta)

Link to this comment:

Share to:

All Comments (93)

Sign In or Sign Up now to post a comment!
  • I've read about this thought experiment. It assumes that the observer outside the train can "see" the light pulse. They can't because it never entered their eyes or instruments. This thought experiment is pure madness.

  • Prove time exists as a physical part of the universe before you say it exists. Only insane people believe it is possible to get something from nothing.

    Matter, Gravity, Energy, Motion, Heat, Cold,

    Light, Electricity, Radiation, Magnetic Fields, Sound, Wind etc all have to come from something somewhere.

    They all come from the same place from the same thing. The place and thing is the so called "nothing" or "empty space".

  • At what speed would the spacecraft be traveling according to the observer? If the answer is C, would the observer see the spacecraft and light traveling at the same speed?

  • I started watching this and thought my winamp or some background youtube video started playing Aphex Twin, so before I continue watching your video, I commend you on your musical taste, Sir.

  • PS: the music in the middle was a bit of a practical joke. I do hope that the formula on the screen at that time gave you more of a shock than the music ;)

  • @Nidhogg05 Yeah, the porn music needs to go. I just can't watch this.

    Nothing personal.

  • @cybervoid it's aphex twin, aphex twin is possibly the best (or at least most influential) electronic musician of our time.

  • final

    As for the light-clock, this is a thought-experiment, the predictions it makes (the formula) have been verified and form the basis of our current understanding of the physical world. It's called ''special'' because it only talks about a special circumstance (no gravity, just light). It's a thought experiment that is at the beginning of the relativity theory, the one that changed our perspective forever. It's the early incarnation of the idea, not the finished product.

  • The argument that ''this doesn't work with a mechanical clock'' is irrelevant, because special relativity doesn't describe such an occurance. SRT only deals with light, and not with gravity. A mechanical clock does undergoe time dilation, but this can only be explained by the bending of space-time due to gravity, in general relativity.

    PS: the mechanical clock does suffer time-dilation, just like anything else. To say that it doesn't breaks every aspect of relativity.

  • To react to a few common questions: 1

    The triangle in the moving clock is caused by the observer standing still, while the clock is moving past you at speed (v). To an observer in the train, point A and C are at the same location, to the person on the ground, they are apart. It's not about the angle, but about the the fact that to the observer the distance by the light traveled in the same time seems bigger (because of the forward speed) than to the observer in the train. the dilation effect.

  • why is this Video have BULLSHIT MUSIC put to it ?

  • what is that last pianosong?

  • yeah i guess i'm not a smartie either :(

  • i no smartie!! :'( why am i watching this? coz i thought i was smart. gee..i'm 17 almost 18 do i am considered as stupid for not understanding this? they never taught me this in school though. the highest level i learn in physics is e=mc2.

  • Found this video quite helpful, compared to others.

  • shouldn't they add the speed of earth rotation and galaxy movement as well?

  • again with the light clock... show me with a clock that has gears and a battery... simply isn't true the instrument is flawed and cannot measure time accurately in motion without calibration, doesn't mean time actually passes slower jeez, you know how many gullible people actually believe this nonsense...

  • @alcolyte76 omg are you saying you dont accept time dilation they have tested it with atomic clocks, yes that means calibrated, in earths orbit at fast speeds that would produce time dilated effects, and it did so they proved time dilation..they also measure the redshift of light particularly light during an eclipse to show the light of the sun moved when the effects of the moons gravitational feild moved, proving relativity again and again

  • @420dankykush atomic clocks have the same issue... try showing it with a MECHANICAL clock... isn't going to happen... because it DOESN'T happen with a mechanical clock lmmfao

  • @alcolyte76 im sure every educated person agrees when i say you need to do your homework and learn some things about the physical principles keeping you alive before you feel like preaching about them so ignorantly :D ;d sorry for sounding stern buddy cya

  • @420dankykush lmao you act like you know me... I have passed the highest college math classes offered, I have a masters in electrical and you think I don't understand the physics? I understand what he is saying but I disagree with him, just like matter can travel faster than the speed light... is being proven wrong in our time maybe you should lay off the kush and think a little harder about it

  • @alcolyte76 i stand by my statement what i say is final boy you lieing feind of run a muck piss

  • @420dankykush stand by it all you want pothead.... doesnt make it true... many stand by evilution too even though it has been disproven over and over and... over lmao I personally believe in science not science fiction...

  • @alcolyte76 you ignorant twit thats what you are sir i am standing by it along with facts and logical ppl, not standing alone like those who cant accept transcedental truths like evolution and time dilation, who are you and who do you think you are for confusing these users with your nonsense? stop throwing everybody off, stop advertising your science-run-a-muck, you take some good education and you taint it with your misconception, its so sad

  • without even sayin that you might start seen the basic compositions of light, to me light is a bunch of small lil dots put in a wave formation like and they all are not connected but rather everytime a light beam is created or made it takes the momentum and the enery to sustain it to create a reaction at a smallest level but noticeable enough to feel its pressence, why wavy traveling is better? i always see my surroundings as if was a less dense water everywhere same rules and techniques

  • if light has a starting piont and an end point and if you travel right by its side at the same speed all you are gonna see is star like shimerigs as light cannota reflect and go back to your eyes since you both passed every point light could reflect. time dilation is another proof that light goes fast but not fst enought to be cought at the moment of its starting point by the observer, in other words is like an echoe that has not yet gatten to the point of absorbtion and reflect of itself.

  • idk, i always figured that this was more-so a physics paradox, just as

    1=sqrt1=sqrt[(-1)(-1)]=sqrt(-1­)*sqrt(-1)=(i)(i)=-1

    is a mathmatical paradox.

  • @gerbils4 .. no .. its just that you made a mistake. Your own errors are not paradoxes.

  • @MrRonslow care to explain my mistake?

  • Im sooooooooooooooooo confused!!!!!!!!!!!!!! great explanation but I haven't even began algebra yet

  • great vid

  • You don't have to add annoying music to make your videos more interesting

  • Theory of relativity and shitty ass music don't mix.

  • thumbs up for FLIM : )

  • FLIM!!!!

  • The math aside can you explain how this beam of light that is already traveling up & down between these two mirrors at the light constant of 186k p/s, could move in a forward direction at any speed with out breaking that constant.....Ok just a pinch of math...the 186k traveling between the mirror + the velocity of the train = greater than 186k ( my A to my Q would be if the train was moving at 6k p/s then the light beam between the two mirrors slows to 180k ) is that the solution to my dilemma?

  • So you have an equation (at 3:38), you have the square root of [ Lo^2+(vDt/2)^2) ], when you're squaring both sides (to get rid of the sqrt) why aren't you applying newton's binom formula? (a+b)^2 = a^2 + 2ab+ b^2

  • relativity is bullshit, it comes down to perception. You might be able to fit a lot into 1 second, but time is constantly irrelevant, distance is the only thing that changes.

    1mph or 186000mph thats it. fuck the THEORY

  • it's nice but when it goes to 4:30 i thought the video is just a joke :O

  • - it is possible to criticize paradigms such as the Michelson and Morley experiment, the relativity of simultaneity thought experiment and the light clock

    - search at YouTube using those 5 keywords in a row : michelson morley critique

    - the video explains the flaws and introduces a detailed website discussing those flaws in these paradigms

  • I havn't got time for this

  • you give completely wrong theory

    

  • your video completely trashes itself when you crank the volume of the head banger music. It was all I could do to drop the web page before everyone in the room was screaming.

  • @Cyberdactyl it was a bit of practical joke from my side ;)

  • Comment removed

  • man, at 4.30 i was laughing very hard XD

  • As soon as you set your "Light clock" in motion it needed recalibrating. Time did not change, your clock did. What ever happened to a good old Rolex.

  • You see - he's using physics notation that is covered in high school and classic mechanics - you also go through these things in Calculus. When you talk about things like "Delta T and Delta X" - people without a background in basic physics or calculus won't have a clue what you're talking about. You clearly need more than high school math to understand SR. Anyone who actually understands SR would know this.

  • always find it humorous when people explain relativity or quantum mechanics on the youtube comment section.

    The truth is that the mathematics and physics involved in these are staggering beyond belief and that the person explaining it is usually regurgitating a layman's explanation they saw on TV.

    Even with a Ph.D in quantum optics and mechanics, one has trouble making sense of the material -- let alone explaining it.

    At least I find this to be the case in my life

  • @MrMillsms

    You need to differentiate between special and general relativity. Special relativity (as explained in this vid) uses no more than logic and high school math. The calculation in the vid is the same one you'll be taught in a physics course. The math behind special relativity is so easy that it makes an excellent subject for a youtube video, because you don't need a PhD to understand it. In short, special can be outlined in a youtube vid, general requires 5 years of studying ;)

  • @Nidhogg05

    Yes, I should have said General Relativity. 

  • @Nidhogg05 lol - so that's why SR is taught to second and third year University students studying engineering and physics. Because you don't need a basic foundation in classical mechanics after all - you just need basic high school math! Because they teach you all about the notation used in physics in just a basic algebra course, right? You should automatically understand everything even though you LEFT OUT two dimensions regarding SR. You need a background in classical mechanics and GR befor SR

  • @Nidhogg05

    The maths involved is not as simple as you believe. I've so far done my GCSE, A level and currently a degree in Maths with a Minor in Physics and I'm still struggling to understand the concept, seeing as the need is not for logical thinking, but for the ability to completely forget any logic involved for the first few times going through it.

    After that it seems to make up it's own logic that you simply continue to believe, in the hope that eventually it makes sense...........

  • @Nidhogg05

    The maths involved is not as simple as you believe. I've so far done my GCSE, A level and currently a degree in Maths with a Minor in Physics and I'm still struggling to understand the concept, seeing as the need is not for logical thinking, but for the ability to completely forget any logic involved for the first few times going through it.

    After that it seems to make up it's own logic that you simply continue to believe, in the hope that eventually it makes sense...........

  • @Nidhogg05 u re absolutely rigth about -no more than high school math.i tried to understand that time dilation formula from wikipedia relavistic equations and i got it haha i was surprised how much easy it was but after that easy triangle equation i realised human brain is not that special on thinking about time ,probably many other things too.i didnt want to die without understanding it .im happy now:)

  • @MrMillsms My guess you treat anything relating to physics with a kind of awe. At least that is the impression I get from a comment you made in some Kaku video. I assure you that there is no need. Nidhogg is right. The truth behind special relativity can be sufficiently explained in one small video.

  • In the classic falling elevator experiment. A person jumping just before a falling elevator hits the ground, Could this person live if they jumped a few mph slower in the opposite direction then the falling elevator?

  • at 3:56 i cant see how you got rid of the two in v delta T over 2 all squard, for it to be - V delta T all squard. :( it's the one part i cant understand, can you help me please?

  • Comment removed

  • Comment removed

  • Comment removed

  • Great ! Tks. Now i got it.

  • 5 stars for sure. Too bad you cant star videos nowadays, so i'll just 'like' :P

  • Beautiful!

  • humans have an idea of what time is . and true physics doesnt because in e=mc2 states time doesnt exist .. it simply spacetime . one word we only perceive it as time because as u travel through space the adams in our bodies take longer to move from space to space aslwell as everything we make such as clocks ... wich let us perceive "time" quite literally going slower

  • @heyafro: You are an idiot. You spell like a 3rd grader. Adams? No. Adam is a person's name. You mean to say atom. And you do a poor job of explaining anything.

  • @heyafro

    >adams

  • It is odd we have time dilation but in physics we have no understanding of what time is.

  • What is the name of that piano song?

    I've searched Deftones & Aphex Twin but I can't find that song, is there an actual name for it or is it yours?

    If it is it's good & I'd like an mp3 of it :)

    I'll check back soon, hopefully you'll comment :)

  • @sponsoredwalk1

    Aphex Twin - Flim

  • hey I'm sorry to bother you again but I can't find the song.

    I should have said that I'm talking about the piano music that kicks in from 3.12 to the end, it's just amazing and sticks in my head but I've looked & looked & it's not in any version of the Aphex Twin song that I've found.

    Woud you mind letting me know the name of that piano piece?

    Thanks again & thanks for the video, hopefully you'll do a GR video someday for all of us who strive towards hyperbolic geometreyness :p

  • @sponsoredwalk1

    Im sorry, i forgot i put in another song, it's also by Aphex Twin, called "Avril 14th"

  • Amazing, thank you :)

  • well explained.

  • Nice!

  • Thank you. More please!!!

  • Enjoyed the video. .Getting to listen music was a Surprise!!

    Especially the first song.  Film by Aphex Twin

    I wonder how popular that song became. I can recognize it, but whom else?

  • Instantly I did. But I love AT..

  • xlightwavex, I'm explicitly leaving out gravity and acceleration because this is a movie about special relativity, I might make one about general relativity later.

    Ackreti, I might make a video on that someday, but I would fit it in with general relativity.

  • this is the explaination for simultaniety einstein explained gravity by the elevator example if you never had been in a elevator

    if you push up you might feel like gravity is increaseing if you had no knowlege of the fact that it was actually moving upwards

    that is litterally the bending of space time

    which is no different when you accelorate or when you are introduced to a gravitaional feild

  • You explain time dilation caused by speed. I would prefer gravitational time dilation explained....

  • on the first image of the moving clock is delta x the change in distance? And from what point to what point.

  • Crap.

  • "delta" t is the "change" in time

  • What exactly is (delta)t'?

  • wow. That was a great vid. Really explained alot. I knew about time dilation but i dint understand why it happened.

    Thank you. That was great for ur first video.

  • gah i was all set to 5 star this video when 4:30 rolled around.

  • @oEQjet *sigh* back when there was stars. :(

  • at exactly 5 minutes, you say the effect has been experimentally proven, Can you provide me with some information on the experiment? I have been looking for it and have had no success.

  • It's called the Hafele-Keating experiment, look it up on wiki or google it :)

    It's the experiment with the clocks on the planes.

  • :o

    damn you and your lens flare!!

  • fairly impressive their Nid, but i have one piece of advice:

    NEEDS MOAR LENZ FLAREZ!

  • Nice and easily understandable video explaining relativity and time dilation. Thank you.

  • Great vid, i can't believe i followed most of that lol. Make another if u have the time

Loading...
Alert icon
0 / 00Unsaved Playlist Return to active list
    1. Your queue is empty. Add videos to your queue using this button:
      or sign in to load a different list.
    Loading...Loading...Saving...
    • Clear all videos from this list
    • Learn more