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Physics, Astronomy & Cosmology / Re: Where did the big bang come from?
« on: 18/05/2024 06:10:31 »Both clocks are at an airport. One remains at the airport (the one I said is stationary)Earth is spinning, so relative to any inertial frame, that airport is accelerating. it isn't stationary at all.
So if your Blackbird flies west, it will meet the airport after 12 hours on the other side, and both Blackbird and airport got there in about the same time, same speed, different directions. I could not say which clock would read the greater elapsed time.
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The exercise is to meditate going with the clock on the plane then repeating while staying on the ground in hopes to reconcile how the 2 clocks would not indicate the same time has passed.A human keeping the clocks company would have no effect on the experiment.
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My conclusion was that time contracts, that you call dilation.The rest of the world calls it dilation, so best not to make up new words for established concepts.
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But now, I can't understand what you are saying about it being relative to the observer.It's relative to an inertial frame. The typical 'observer' is often just there to identify the frame: "The frame in which Bob is stationary". Bob could be a cardboard picture of a guy. His presence or absence does not affect the physics.
The basic gist under special relativity is that relative to any inertial frame, fast moving clocks tick slower than slower clocks. But this is relativity, so relative to that 'fast moving' clock, it is all the other clocks that tick slower. Any clock is stationary in its own frame by definition, so it runs at 'normal' speed in that frame.
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The 2 clocks show a different time but relative to the observer. So how are the 2 clocks off?The two clocks in say the airplane experiment show different times. This comparison is objective, not relative to anything.
How much apart? It depends on the situation. For your west-flying Blackbird, I could not say which clock would log more elapsed time. If the plane flew west, the Blackbird clock would show less elapsed time.
The famous HK experiment that first did this had slow airplanes that landed periodically, but eventually made it all the way around. The time difference was 59 nanoseconds less if eastbound, and 273 nanoseconds more if westbound.
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Like if someone lives at the top of the Himalayas and another lives in an underground cave, time would not pass the same for the 2.That's time dilation due to gravity, yes. The HK thing had to take that into account since the airplane was often at higher altitude than the clock on the ground.
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How about a spaceship that goes far away at high speeds and comes back, wouldn't the time it was gone be different from the time that passed on earth by years?Yes, it can be much less. If your ship is fast enough, you could age 1 year and you find that 200 years has passed on Earth when you get back.
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