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For questions related to observers in relativity or quantum mechanics.

-1 votes
5 answers
147 views

What is preventing this statement to be true: the twin brother who accelerated away is reall...

To summarize the twin paradox: the brother who was in the rocket and flew away is the one having a slower time, because he "accelerated", decelerated and then accelerated again and came back to Earth, …
nonopolarity's user avatar
-6 votes
2 answers
122 views

Does this break relativity? A humming bird is flying 30 km/h inside of a train [duplicate]

If I am in a high speed train, and I am sitting there, and I see a hummingbird flying $ 30 km/h $ relative to me towards the head of the train. We all know, the scenario above is 100% possible by phys …
nonopolarity's user avatar