pglpm
@pglpm@lemmy.ca
- Comment on A little physics riddle 5 weeks ago:
Completely agree, which I think is very interesting. In Newtonian mechanics, some scalar and vector quantities such as mass, internal energy, contact forces (stress), heat flux are frame-indifferent. Other, such as velocity and acceleration, are frame-dependent but we do have transformation rules for them. Some quantities – and quite important ones – such as momentum, are in a sort of limbo: they are frame-dependent, but there’s no clear transformation rule for them.
From the point of view of relativity theory, it’s interesting to note that for this particular case of coordinate transformation – note that it is not a Lorentz boost – we can actually calculate the spatial components of momentum in the new coordinate system, if the reported momentum is expressed as a covariant vector (p_µ). This is because its unknown temporal component (energy) gets multiplied by zero in this transformation. But the text is ambiguous on whether the reported components are covariant or contravariant.
- Comment on A little physics riddle 5 weeks ago:
Regarding the third body, consider the case where its mass is, say, 2 kg, and the case where it’s 1 kg instead (the momentum being the same).
- Comment on A little physics riddle 5 weeks ago:
Yes we’re considering Newtonian mechanics in any case. What I’m especially curious about is what physical principles people use to motivate their answers.
- Submitted 5 weeks ago to physics@mander.xyz | 5 comments
- Submitted 1 month ago to science@mander.xyz | 1 comment
- Comment on Man Arrested for Sharing Copyright Infringing Nude Scenes Through Reddit. 3 months ago:
It seems to me these scenes are introduced in films to sexualize them. Most often than not they don’t add anything to the story. But blood & sex get more viewers. So I find the whole thing hypocritical.
Brings me to mind an episode of the hilarious series “Coupling”, where Jeff says that the actress in the film “The Piano” (?) was naked in the whole film. His friends say she wasn’t, it was only a scene in the film. And Jeff replies “it depends on how you watch it” 🤣
- Comment on Matrix let-down 4 months ago:
Agree 110%! It’s sad because it pushes back those people who were curious about alternatives and were willing to try. Hopefully things will improve with time…
- Comment on Matrix let-down 4 months ago:
I’ve tried different clients: Element web, desktop, and android, and FluffyChat desktop and android. The problems seems to come, as other have written, when the matrix.org server is involved: it’s people from their handle there which experience glitches joining rooms in other servers. It seems this “part” of the fediverse still needs a lot of development.
- Comment on Matrix let-down 4 months ago:
I didn’t know about !matrix, cheers!!
- Submitted 4 months ago to fediverse@lemmy.world | 46 comments
- Submitted 4 months ago to technology@lemmy.world | 66 comments
- Comment on AI Doomerism: Intelligence Is Not Enough -- “The lack of arms and legs becomes really load-bearing when you want to kill all humans.” 1 year ago:
Thank you for the explanation! – it puts that sentence into perspective. I think he put it in a somewhat unfortunate and easily misunderstood way.
- Comment on AI Doomerism: Intelligence Is Not Enough -- “The lack of arms and legs becomes really load-bearing when you want to kill all humans.” 1 year ago:
“Bayesian analysis”? What the heck has this got to do with Bayesian analysis? Does this guy have an intelligence, artificial or otherwise?
- Comment on A peaceful protest againt Web Environment Integrity 1 year ago:
It’s reached 333 protesters! that’s 1/3 of the way to 1000, it’d be cool if it kept on going :)
- Comment on A peaceful protest againt Web Environment Integrity 1 year ago:
Neat idea! +1
- Comment on A peaceful protest againt Web Environment Integrity 1 year ago:
Luckily “effectively the standard” is just a temporary thing. What browser was considered “standard” has changed many times in the past, and will continue to change in the future. Of course for this to happen everyone who cares must keep on pushing.
- Comment on Typography & fonts: A community to discuss and share information about typography and fonts. 1 year ago:
Sounds interesting, go ahead!
- Comment on Instance Assistant v1.2.3 is now available on Chrome & Firefox + New Features 1 year ago:
It has helped me invaluably, thank you!
By the way, the “trigger search” button at the moment leads to a search with text
community!community@instance.etcbut the first
communityshould be dropped. OK this is not the place for tracking issues, sorry! - Comment on Typography & fonts: A community to discuss and share information about typography and fonts. 1 year ago:
Interesting – it doesn’t appear in browse.feddit.de yet! Then I delete the one I just created, I don’t like redundancy.
- Submitted 1 year ago to newcommunities@lemmy.world | 4 comments
- Submitted 1 year ago to fediverse@lemmy.world | 0 comments
- Comment on Terrible Estate Agent Photos (badrealestate) - estate agent/realtor photos that are so bad they’re funny. 1 year ago:
Great community! Sorry must go – peeing myself after seeing the first posts there 🤣
- Submitted 1 year ago to science@mander.xyz | 1 comment