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Orodruin's latest activity
Orodruin
replied to the thread
I
3-parameter group of symmetries on the plane
.
There is at least one homomorphism (although not necessarily a surjective nor injective one) between any two groups. Consider the map...
Today, 4:02 PM
Orodruin
reacted to
Ibix's post
in the thread
I
Standing light waves if one-way speed of light was not constant?
with
Like
.
See here. Changing the one way speed of light is just messing with your synchronization convention. It just changes your interpretation...
Today, 1:06 PM
Orodruin
replied to the thread
I
Pullback & orthogonal projector
.
What kind of manifolds are M and N? In a Riemannian manifold I would expect a minus sign in the orthogonal projection. In a...
Today, 1:06 PM
Orodruin
replied to the thread
Planet moving in elliptical orbit around a star
.
Not exactly. The angular momentum depends only on the tangential component of the velocity. As such, ##\omega r## is definitely equal...
Today, 7:45 AM
Orodruin
replied to the thread
Planet moving in elliptical orbit around a star
.
Just let me emphasise that you most definitely cannot use that formula. It assumes that the radius is constant, which directly...
Today, 6:54 AM
Orodruin
replied to the thread
Damped harmonic oscillation
.
You are missing the point completely. Writing out the projected equation is absolutely proper. There is not a single thing inappropriate...
Today, 5:39 AM
Orodruin
replied to the thread
I
Color charge is not scalar -- do their components have dimensions?
.
From a theory point of view this is true. However, from a metrological point of view in SI units, electric charge is fundamental and the...
Today, 3:06 AM
Orodruin
replied to the thread
Damped harmonic oscillation
.
I mean, ultimately it comes down to if you want everyone to necessarily write vector arrows on everything that would need it in three...
Yesterday, 4:56 PM
Orodruin
replied to the thread
Today I Learned
.
TIL that the word citron, which is the Swedish word for lemon, exists in English but refers to what we in Swedish call a true lemon.
Yesterday, 2:38 PM
Orodruin
replied to the thread
I
3-parameter group of symmetries on the plane
.
Yes.
Yesterday, 1:32 PM
Orodruin
replied to the thread
I
Global properties of the universe
.
I count half defined constants … unless you use geometrized units and also put G = 1. The Stefan-Boltzmann constant is also a...
Yesterday, 11:52 AM
Orodruin
replied to the thread
I
Global properties of the universe
.
Many of the constants you mention are arbitrary conventions set by our choice of physical units. So mostly no for any of those. To give...
Yesterday, 10:31 AM
Orodruin
replied to the thread
Damped harmonic oscillation
.
My point is that the x-component in one system is not the same as the x-component in another system. Taking the x-component of a vector...
Yesterday, 10:08 AM
Orodruin
replied to the thread
I
manifold with boundary
.
This would depend on what kind of boundary conditions you impose. As far as we can tell though, there is no evidence whatsoever to imply...
Yesterday, 4:10 AM
Orodruin
replied to the thread
Damped harmonic oscillation
.
Wait, I don’t have to come to work on Monday?!? How do I tell my students? I am supposed to give a lecture at 10 am. 🙂
Yesterday, 1:34 AM
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