Also angles
Would love to hear how mass is measured in seconds though
this post was submitted on 02 Sep 2024
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Angle: seconds
Mass in seconds? How? I get mass in Joules, but seconds?
I measure the mass of my stool by seconds it takes to discharge
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'm hungry for more; may I have seconds?
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
Everything should just be in eV. Particle physics natural units are the best.
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)
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
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
all the same thing anyway
Please Sir, can I have some more?
Lash him! Ridicule him! This boy wants seconds!
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
I know some people that should measure their weight in mass per second.
Can I get a conversation table?
Shouldn't m = F/a so n/s^2?
I don't know anybody using just seconds. I use natural units and my simulation buddies use their funny cgs units.