this post was submitted on 02 Sep 2024
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Science Memes

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[–] sharkfucker420@lemmy.ml 89 points 10 months ago* (last edited 10 months ago) (2 children)

Also angles

Would love to hear how mass is measured in seconds though

[–] mkwt@lemmy.world 39 points 10 months ago (1 children)

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 57 points 10 months ago (1 children)

My brother, that explanation is not nearly dumbed down enough and as with most math wiki is useless for eli5 stuff.

[–] mkwt@lemmy.world 43 points 10 months ago (1 children)

I think a lot of people understand the concept of light-seconds, which can measure distance in seconds.

Allow me to introduce the gravity-second. 1 gravity-second of mass-energy is enough mass-energy to have a Schwarzchild radius of 2 light-seconds.

[–] pythonoob@programming.dev 21 points 10 months ago (1 children)

I get what you're saying but am still too dumb to understand it lol

[–] davidgro@lemmy.world 34 points 10 months ago (1 children)

Size of a black hole.

Certain mass = certain distance

Distance = seconds

Therefore mass = seconds

[–] uis@lemm.ee 9 points 10 months ago (1 children)

Then I don't even want to be in same solar system with millisecond heavy object.

[–] davidgro@lemmy.world 10 points 10 months ago

You most certainly don't, that's a radius of about 300km (186 miles) and a mass of 101 suns.

Even if you meant microsecond, that's 1/10 of the sun, and would be very disruptive.

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[–] Kowowow@lemmy.ca 45 points 10 months ago (1 children)
[–] thenextguy@lemmy.world 35 points 10 months ago (1 children)
[–] SpaceNoodle@lemmy.world 22 points 10 months ago (1 children)
[–] cafeinux@infosec.pub 29 points 10 months ago (4 children)
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[–] Limonene@lemmy.world 40 points 10 months ago

Rocket scientists be like:

Fuel efficiency: seconds.

[–] Leate_Wonceslace@lemmy.dbzer0.com 33 points 10 months ago (3 children)

Wait, how do you measure mass in seconds?

[–] ScampiLover@lemmy.world 22 points 10 months ago (1 children)

Time taken for me to eat that mass of hotdogs

[–] Leate_Wonceslace@lemmy.dbzer0.com 6 points 10 months ago

Choking_Hazard.txt

[–] reinei@lemmy.world 5 points 10 months ago* (last edited 10 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 extremely useful!

[–] ArbitraryValue@sh.itjust.works 24 points 10 months ago (1 children)

Why is the astrophysicist wearing gloves? Is he trying to dispose of a body?

[–] sleen@lemmy.zip 23 points 10 months ago (1 children)

You don't want to know what an astrophysicist does in their free time.

[–] ArbitraryValue@sh.itjust.works 10 points 10 months ago* (last edited 10 months ago) (1 children)

Well the one I knew spent his free time doing community theater, having many of the women there 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.

[–] cafeinux@infosec.pub 6 points 10 months ago

I intended to be an astrophysicist before finally settling on IT, and I was doing theater before life did its things and I had to stop. I'm kinda religious but not THAT religious (and my SO is an atheist so, really not THAT much).

Maybe there's kind of a type anyway.

[–] uis@lemm.ee 23 points 10 months ago (4 children)

Mass in seconds? How? I get mass in Joules, but seconds?

[–] Eiri@lemmy.ca 10 points 10 months ago* (last edited 10 months ago) (3 children)

There are two possibilities I can think of:

  • 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
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[–] SaharaMaleikuhm@feddit.org 7 points 10 months ago

I measure the mass of my stool by seconds it takes to discharge

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[–] someguy3@lemmy.world 23 points 10 months ago (1 children)

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 18 points 10 months ago* (last edited 10 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) part and the second minute part of the hour.

[–] IndiBrony@lemmy.world 21 points 10 months ago (1 children)

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 10 points 10 months ago (1 children)

But do you remember the Krebs Cycle?

[–] thenextguy@lemmy.world 11 points 10 months ago

!https://i.ytimg.com/vi/27x0wiuTYoE/maxresdefault.jpg

[–] tiredofsametab@fedia.io 20 points 10 months ago

I'm hungry for more; may I have seconds?

[–] observantTrapezium@lemmy.ca 18 points 10 months ago (1 children)

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 13 points 10 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

[–] Sasha@lemmy.blahaj.zone 17 points 10 months ago (3 children)

As a theoretical physicist, units are for chumps

[–] qjkxbmwvz@startrek.website 9 points 10 months ago (1 children)

It's easy to remember c and ℏ if they're both 1...

[–] Sasha@lemmy.blahaj.zone 4 points 10 months ago

Constance? Never heard of her

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[–] drail@fedia.io 16 points 10 months ago (1 children)

Everything should just be in eV. Particle physics natural units are the best.

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[–] FiskFisk33@startrek.website 13 points 10 months ago (1 children)
[–] uis@lemm.ee 5 points 10 months ago (1 children)

Rads. But radians are fine too.

[–] frezik@midwest.social 5 points 10 months ago (3 children)

Tau (τ). A full circle is just 1τ instead of 2π.

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[–] montechristo@feddit.org 8 points 10 months ago* (last edited 10 months ago)

If you ever find yourself among theoretical physicists and/or astrophysicists and need a conversation starter, just ask about unit systems or unitless/natural measurement systems. There is no other profession that is more obsessed about that topic.

Just to put this here:

ħ=1

[–] EarthShipTechIntern@lemm.ee 6 points 10 months ago

Please Sir, can I have some more?

Lash him! Ridicule him! This boy wants seconds!

[–] m0darn@lemmy.ca 6 points 10 months ago (2 children)

Don't they measure distance and time by redshift (ie colour)

[–] Generous1146@beehaw.org 7 points 10 months ago (1 children)

What even is color if not seconds^-1?

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[–] Allero@lemmy.today 5 points 10 months ago (2 children)

They normally use parallax-seconds, i.e. parsecs, for long distance objects.

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[–] LazaroFilm@lemmy.world 5 points 10 months ago (1 children)
[–] SpaceNoodle@lemmy.world 10 points 10 months ago (1 children)

Sounds like that reduces to hertz, which I'm sure they'll just express in seconds.

[–] tallricefarmer@sopuli.xyz 6 points 10 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 4 points 10 months ago

I know some people that should measure their weight in mass per second.

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