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Seconds (mander.xyz)

submitted 10 months ago by [email protected] to c/[email protected]

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[-] [email protected] 82 points 10 months ago* (last edited 10 months ago)

Also angles

Would love to hear how mass is measured in seconds though

[-] [email protected] 39 points 10 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

[-] [email protected] 57 points 10 months ago

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

[-] [email protected] 42 points 10 months ago

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.

[-] [email protected] 21 points 10 months ago

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

[-] [email protected] 33 points 10 months ago

Size of a black hole.

Certain mass = certain distance

Distance = seconds

Therefore mass = seconds

[-] [email protected] 9 points 10 months ago

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

[-] [email protected] 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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[-] [email protected] 45 points 10 months ago

Angle: seconds

[-] [email protected] 34 points 10 months ago

Dessert: seconds

[-] [email protected] 22 points 10 months ago

Motion: seconded

[-] [email protected] 28 points 10 months ago

Breakfast: second

[-] [email protected] 5 points 10 months ago

That’s elevensies.

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[-] [email protected] 38 points 10 months ago

Rocket scientists be like:

Fuel efficiency: seconds.

[-] [email protected] 33 points 10 months ago

Wait, how do you measure mass in seconds?

[-] [email protected] 22 points 10 months ago

Time taken for me to eat that mass of hotdogs

[-] [email protected] 6 points 10 months ago

Choking_Hazard.txt

[-] [email protected] 14 points 10 months ago

https://www.science.org/doi/10.1126/science.1232923

[-] [email protected] 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!

[-] [email protected] 23 points 10 months ago

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

[-] [email protected] 23 points 10 months ago

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

[-] [email protected] 10 points 10 months ago* (last edited 10 months ago)

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.

[-] [email protected] 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.

[-] [email protected] 21 points 10 months ago

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

[-] [email protected] 10 points 10 months ago* (last edited 10 months ago)

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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[-] [email protected] 7 points 10 months ago

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

[-] [email protected] 4 points 10 months ago

Well the modern definition of a kg is based off of the second and the metre https://en.m.wikipedia.org/wiki/Kilogram :P

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[-] [email protected] 21 points 10 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.

[-] [email protected] 16 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.

[-] [email protected] 21 points 10 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!

[-] [email protected] 10 points 10 months ago

But do you remember the Krebs Cycle?

[-] [email protected] 11 points 10 months ago

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

[-] [email protected] 19 points 10 months ago

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

[-] [email protected] 18 points 10 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)

[-] [email protected] 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

[-] [email protected] 17 points 10 months ago

As a theoretical physicist, units are for chumps

[-] [email protected] 9 points 10 months ago

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

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[-] [email protected] 15 points 10 months ago

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

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[-] [email protected] 12 points 10 months ago

angle: seconds

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[-] [email protected] 7 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

[-] [email protected] 6 points 10 months ago

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

[-] [email protected] 7 points 10 months ago

What even is color if not seconds^-1?

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[-] [email protected] 5 points 10 months ago

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

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[-] [email protected] 6 points 10 months ago

Please Sir, can I have some more?

Lash him! Ridicule him! This boy wants seconds!

[-] [email protected] 5 points 10 months ago

Acceleration….

[-] [email protected] 10 points 10 months ago

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

[-] [email protected] 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

[-] [email protected] 4 points 10 months ago

Shouldn't m = F/a so n/s^2?

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this post was submitted on 02 Sep 2024

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