Angle: seconds
Seconds
Submitted 8 months ago by fossilesque@mander.xyz to science_memes@mander.xyz
https://mander.xyz/pictrs/image/a128dc2f-35de-4a3a-8098-6ec11805536d.png
Comments
Limonene@lemmy.world 8 months ago
Rocket scientists be like:
Fuel efficiency: seconds.
Leate_Wonceslace@lemmy.dbzer0.com 8 months ago
Wait, how do you measure mass in seconds?
ScampiLover@lemmy.world 8 months ago
Time taken for me to eat that mass of hotdogs
Leate_Wonceslace@lemmy.dbzer0.com 8 months ago
Choking_Hazard.txt
GiveMemes@jlai.lu 8 months ago
reinei@lemmy.world 8 months ago
Just as particle physicists measure everything in energy (eV to be precise…)
Mass? eV Energy? eV Distance? 1/eV Time? Guess what: 1/eV as well! This also means velocity has unit 1…
And the worst part: it turns out to be edtremely useful!
uis@lemm.ee 8 months ago
Mass in seconds? How? I get mass in Joules, but seconds?
Eiri@lemmy.ca 8 months ago
There are two possibilities:
- Orbit duration can be used to calculate mass
- The diameter of a star or the parallax distance on the sky (in arcseconds) can also be used to evaluate mass
Lifter@discuss.tchncs.de 8 months ago
Size doesn’t say much about mass though.
SaharaMaleikuhm@feddit.org 8 months ago
I measure the mass of my stool by seconds it takes to discharge
HereIAm@lemmy.world 8 months ago
Well the modern definition of a kg is based off of the second and the metre en.m.wikipedia.org/wiki/Kilogram :P
Gonzako@lemmy.world 8 months ago
The amount of time a mass M attracts a unitary sphere up into CoM.
someguy3@lemmy.world 8 months ago
Fun fact: Seconds are called seconds because the first breakdown of an hour is the minute, and the second breakdown is the second. Don’t ask me the obvious question(s) because I don’t know.
f314@lemmy.world 8 months ago
If by obvious question you mean “why is it called a minute,” that is because “minute” means “small.” So you have the first minute (small) division and the second minute division of the hour.
ArbitraryValue@sh.itjust.works 8 months ago
Why is the astrophysicist wearing gloves? Is he trying to dispose of a body?
sleen@lemmy.zip 8 months ago
You don’t want to know what an astrophysicist does in their free time.
ArbitraryValue@sh.itjust.works 8 months ago
Well the one I knew spent his free time doing community theater, having the women there all go crazy over him (he was good-looking and charming), and then not sleeping with any of them because he was a wait-until-marriage religious guy. I don’t think he was typical.
IndiBrony@lemmy.world 8 months ago
Me: not smart enough to understand
Brain: Quick! Say something to sound like you fit in!
Me: uh … I just did the Kessel Run in under 12 parsecs!
fossilesque@mander.xyz 8 months ago
But do you remember the Krebs Cycle?
thenextguy@lemmy.world 8 months ago
Sasha@lemmy.blahaj.zone 8 months ago
As a theoretical physicist, units are for chumps
qjkxbmwvz@startrek.website 8 months ago
It’s easy to remember c and ℏ if they’re both 1…
Sasha@lemmy.blahaj.zone 8 months ago
Constance? Never heard of her
LeFantome@programming.dev 8 months ago
You must love Reynold’s Number:
Sasha@lemmy.blahaj.zone 8 months ago
Oh god, no fluid mechanics is way too difficult. I stuck to studying quantum effects of black holes, which is much easier.
observantTrapezium@lemmy.ca 8 months ago
That may be relativists (they would actually measure anything in units of mass, with everything else defined through G = c = 1). Astrophysicists commonly measure mass in solar masses, long distances in parsec (or kiloparsec, megaparsec), short distances in solar radii or AU, and time in whatever is relevant to their problem (could be seconds or gigayears)
Sconrad122@lemmy.world 8 months ago
short distances in solar radii
I think astrophycisists and I may have a difference of opinion on the meaning of the adjective short
FiskFisk33@startrek.website 8 months ago
angle: seconds
uis@lemm.ee 8 months ago
Rads. But radians are fine too.
frezik@midwest.social 8 months ago
Tau (τ). A full circle is just 1τ instead of 2π.
montechristo@feddit.org 8 months ago
If you ever find yourself among theoretical physicists and/or astrophysicists and need a conversation starter, just ask about unit systems or unit less/natural measurement systems. There is no other profession that is more obsessed about that topic.
Just to put this here:
ħ=1
m0darn@lemmy.ca 8 months ago
Don’t they measure distance and time by redshift (ie colour)
Generous1146@beehaw.org 8 months ago
What even is color if not seconds^-1?
m0darn@lemmy.ca 8 months ago
Yeah true, but I think they actually use wavelength of red shift, which is distance… traveled by light in the time it takes to make a full cycle. So I guess we’re back to seconds again.
I think they use this for distance and time because at scales being dealt with they have the same implications.
Allero@lemmy.today 8 months ago
They normally use parallax-seconds, i.e. parsecs, for long distance objects.
m0darn@lemmy.ca 8 months ago
I think you need to be more specific than ‘long distance’, yes they use parsecs for ‘long distances’ but I believe only for intra-galactic objects. I think other galaxies are too distant for parallax seconds to be useful.
EarthShipTechIntern@lemm.ee 8 months ago
Please Sir, can I have some more?
Lash him! Ridicule him! This boy wants seconds!
LazaroFilm@lemmy.world 8 months ago
Acceleration….
SpaceNoodle@lemmy.world 8 months ago
Sounds like that reduces to hertz, which I’m sure they’ll just express in seconds.
tallricefarmer@sopuli.xyz 8 months ago
They like to set the speed of light to be 1. That is dimensionless 1. It makes their calculations simpler this way instead of dragging some power of c everywhere like a loosely connected trailer on a dirt road.
When i took a particle physics class we measured everything in energy (eV). In this case of measuring everything in seconds, acceration would be measured in units of 1/s
Kolanaki@yiffit.net 8 months ago
I know some people that should measure their weight in mass per second.
0x0@programming.dev 8 months ago
Shouldn’t m = F/a so n/s^2?
mvirts@lemmy.world 8 months ago
E=mc^2 so m is joule seconds^2 / meter ^ 2
F=ma so m is Newton seconds^2 / meter
A joule is 1 Newton / meter so they agree
zkfcfbzr@lemmy.world 8 months ago
A joule is 1 Newton / second, but those units do still agree
Hjalamanger@feddit.nu 8 months ago
Can I get a conversation table?
psme@lemmy.today 8 months ago
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justme@lemmy.dbzer0.com 8 months ago
I don’t know anybody using just seconds. I use natural units and my simulation buddies use their funny cgs units.
sharkfucker420@lemmy.ml 8 months ago
Also angles
mkwt@lemmy.world 8 months ago
Set G = 1 and c =1. Then equations like r = 2m make dimensional sense.
https://en.m.wikipedia.org/wiki/Geometrized_unit_system
phdepressed@sh.itjust.works 8 months ago
My brother, that explanation is not nearly dumbed down enough and as with most math wiki is useless for eli5 stuff.
witty_username@feddit.nl 8 months ago
m=E/c² ?