Angle: seconds
Seconds
Submitted 2 years 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 2 years ago
Rocket scientists be like:
Fuel efficiency: seconds.
Leate_Wonceslace@lemmy.dbzer0.com 2 years ago
Wait, how do you measure mass in seconds?
ScampiLover@lemmy.world 2 years ago
Time taken for me to eat that mass of hotdogs
Leate_Wonceslace@lemmy.dbzer0.com 2 years ago
Choking_Hazard.txt
GiveMemes@jlai.lu 2 years ago
reinei@lemmy.world 2 years 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 2 years ago
Mass in seconds? How? I get mass in Joules, but seconds?
Eiri@lemmy.ca 2 years 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 1 year ago
Size doesn’t say much about mass though.
SaharaMaleikuhm@feddit.org 2 years ago
I measure the mass of my stool by seconds it takes to discharge
HereIAm@lemmy.world 2 years 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 2 years ago
The amount of time a mass M attracts a unitary sphere up into CoM.
someguy3@lemmy.world 2 years 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 2 years 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 2 years ago
Why is the astrophysicist wearing gloves? Is he trying to dispose of a body?
sleen@lemmy.zip 2 years ago
You don’t want to know what an astrophysicist does in their free time.
ArbitraryValue@sh.itjust.works 2 years 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 2 years 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 2 years ago
But do you remember the Krebs Cycle?
thenextguy@lemmy.world 2 years ago
Sasha@lemmy.blahaj.zone 2 years ago
As a theoretical physicist, units are for chumps
qjkxbmwvz@startrek.website 2 years ago
It’s easy to remember c and ℏ if they’re both 1…
Sasha@lemmy.blahaj.zone 2 years ago
Constance? Never heard of her
LeFantome@programming.dev 2 years ago
You must love Reynold’s Number:
Sasha@lemmy.blahaj.zone 2 years 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 2 years 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 2 years 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 2 years ago
angle: seconds
uis@lemm.ee 2 years ago
Rads. But radians are fine too.
frezik@midwest.social 2 years ago
Tau (τ). A full circle is just 1τ instead of 2π.
montechristo@feddit.org 2 years 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 2 years ago
Don’t they measure distance and time by redshift (ie colour)
Generous1146@beehaw.org 2 years ago
What even is color if not seconds^-1?
m0darn@lemmy.ca 2 years 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 2 years ago
They normally use parallax-seconds, i.e. parsecs, for long distance objects.
m0darn@lemmy.ca 2 years 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 2 years ago
Please Sir, can I have some more?
Lash him! Ridicule him! This boy wants seconds!
LazaroFilm@lemmy.world 2 years ago
Acceleration….
SpaceNoodle@lemmy.world 2 years ago
Sounds like that reduces to hertz, which I’m sure they’ll just express in seconds.
tallricefarmer@sopuli.xyz 2 years 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 2 years ago
I know some people that should measure their weight in mass per second.
0x0@programming.dev 2 years ago
Shouldn’t m = F/a so n/s^2?
mvirts@lemmy.world 2 years 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 2 years ago
A joule is 1 Newton / second, but those units do still agree
Hjalamanger@feddit.nu 2 years ago
Can I get a conversation table?
psme@lemmy.today 2 years ago
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justme@lemmy.dbzer0.com 2 years 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 2 years ago
Also angles
mkwt@lemmy.world 2 years 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 2 years 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 2 years ago
m=E/c² ?