Mass in seconds? How? I get mass in Joules, but seconds?
this post was submitted on 02 Sep 2024
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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.
I measure the mass of my stool by seconds it takes to discharge
Well the modern definition of a kg is based off of the second and the metre https://en.m.wikipedia.org/wiki/Kilogram :P
I'm hungry for more; may I have seconds?
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.
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.
As a theoretical physicist, units are for chumps
It's easy to remember c and ℏ if they're both 1...
Constance? Never heard of her
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)
Rocket scientists be like:
Fuel efficiency: seconds.
I know some people that should measure their weight in mass per second.
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!
Don't they measure distance and time by redshift (ie colour)
What even is color if not seconds^-1?
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.
They normally use parallax-seconds, i.e. parsecs, for long distance objects.
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.
Fair!
Thanks for this bit of clarification
angle: seconds
Rads. But radians are fine too.
Tau (τ). A full circle is just 1τ instead of 2π.
Yeah, but everything else is more annoying. 1+e^i(0.5τ)=0 just doesn't hit the same
Euler's identity with tau simplifies to:
e^iτ^ = 1
So it's actually simpler. See: https://tauday.com/tau-manifesto#sec-euler_s_identity
Sure, it's simpler; but it's less elegant
Why is the astrophysicist wearing gloves? Is he trying to dispose of a body?
Everything should just be in eV. Particle physics natural units are the best.
Can I get a conversation table?
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?
!https://i.ytimg.com/vi/27x0wiuTYoE/maxresdefault.jpg
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