PeroK's latest activity
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PeroK reacted to OmCheeto's post in the thread Undergrad Transit time for a round trip to Alpha Centuri... with
Like.
Delightful thread. I worked on this problem over 20 years ago. (except for the relativity part, as I'm a bit slow.) I found it most... -
https://www.cbc.ca/news/entertainment/tim-curry-dead-80-9.7321273 This one seems to have passed under the radar, as he died the same...
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PeroK replied to the thread Undergrad Transit time for a round trip to Alpha Centuri....There is coordinate time and proper time. That is physics. Perception is for the philosophers!
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PeroK replied to the thread Undergrad Transit time for a round trip to Alpha Centuri....The quantity ##\dfrac{dx}{d\tau}## can be greater than ##c##. You have to be able to deal with that! In the traveller's rest frame...
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PeroK reacted to Herman Trivilino's post in the thread Undergrad Transit time for a round trip to Alpha Centuri... with
Skeptical.
No it doesn't. It shows that 3.5 years pass. You're assuming (incorrectly) that 4 light years is the distance traveled. -
PeroK reacted to Ibix's post in the thread Undergrad Transit time for a round trip to Alpha Centuri... with Like.
The question is how you measure distance and how you interpret your instrument readings. Probably the easiest way to do things is radar...
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PeroK replied to the thread Undergrad Transit time for a round trip to Alpha Centuri....There's coordinate time and proper time. I guess that "perceived" time could be taken to be the proper time aboard the spaceship.
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PeroK replied to the thread Undergrad Transit time for a round trip to Alpha Centuri....How would they "see" that?
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PeroK replied to the thread Undergrad Transit time for a round trip to Alpha Centuri....It doesn't matter whether you look out the window or not. Alpha Centauri is about 4.4 light years from Earth, but it's possible to...
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PeroK replied to the thread Undergrad Transit time for a round trip to Alpha Centuri....This is an important point if we consider speeds close to the speed of light. In principle, humans could make an interstellar trip and...
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Hello everyone, My name is Evgeniy. I am an independent researcher with a background in engineering. I have a strong interest in...
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PeroK reacted to anuttarasammyak's post in the thread Undergrad Young's slits with incandescent light source with Like.
Photons do not interfere. Coherence of light does not matter. Interference takes place in a single individual photon. In loose saying a...
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PeroK reacted to Matterwave's post in the thread Graduate What would happen if we changed the quantifiers in a continuity of a function? with Like.
I think you mean ##\exists M## I'm not sure what you're trying to get at with swapping quantifiers in this expression. I can't give...
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PeroK reacted to HanLi's post in the thread High school student with a passion for physics, looking to learn with Like.
Thank you for the warm welcome and for pointing me to Insights! I've already started browsing and found some really interesting...
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PeroK replied to the thread High school student with a passion for physics, looking to learn.:welcome:
