Mass in seconds? How? I get mass in Joules, but seconds?
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
Size doesn’t say much about mass though.
I thought stars of similar masses were also of similar sizes. They’re not?
I’m no astrologer but from what I’ve learned, we also need to look at the color to glassify stars into categories. It varies a bit though in each category so it’s a blunt tool.
Then there are other objects like gas clouds and even galaxies. For those, we have no idea of the density distribution, so radial size gives us even less info.
Well the modern definition of a kg is based off of the second and the metre https://en.m.wikipedia.org/wiki/Kilogram :P
The amount of time a mass M attracts a unitary sphere up into CoM.
Rocket scientists be like:
Fuel efficiency: seconds.
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.
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.
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)
short distances in solar radii
I think astrophycisists and I may have a difference of opinion on the meaning of the adjective short
Also angles
Would love to hear how mass is measured in seconds though
Set G = 1 and c =1. Then equations like r = 2m make dimensional sense.
My brother, that explanation is not nearly dumbed down enough and as with most math wiki is useless for eli5 stuff.
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.
I get what you’re saying but am still too dumb to understand it lol
Size of a black hole.
Certain mass = certain distance
Distance = seconds
Therefore mass = seconds
Then I don’t even want to be in same solar system with millisecond heavy object.
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.
Angle: seconds
Dessert: seconds
Motion: seconded
Breakfast: second
That’s elevensies.
¿Porqué no los dos?
Es un chiste que existe solamente para hacer una referencia al señor de los anillos.
Hotel: Trivago
As a theoretical physicist, units are for chumps
You must love Reynold’s Number:
Oh god, no fluid mechanics is way too difficult. I stuck to studying quantum effects of black holes, which is much easier.
(This isn’t a joke, it’s literally true)
It’s easy to remember c and ℏ if they’re both 1…
Constance? Never heard of her
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!
But do you remember the Krebs Cycle?
angle: seconds
Rads. But radians are fine too.
Tau (τ). A full circle is just 1τ instead of 2π.
Why is the astrophysicist wearing gloves? Is he trying to dispose of a body?
Wait, how do you measure mass in seconds?
Time taken for me to eat that mass of hotdogs
Choking_Hazard.txt
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!
I don’t know anybody using just seconds. I use natural units and my simulation buddies use their funny cgs units.
Shouldn’t m = F/a so n/s^2?
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
A joule is 1 Newton / second, but those units do still agree
Lol wait is a joule actually one Newton meter? 😅
Now I’m so confused
You’ve got it - it is a Newton-meter
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Acceleration….
Sounds like that reduces to hertz, which I’m sure they’ll just express in seconds.
