Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »

Activity for HDE 226868‭

Type On... Excerpt Status Date
Question How are the assumptions behind two ways of deriving the Rayleigh-Jeans law related?
The Rayleigh-Jeans law does a good job of describing the spectral radiance of a black body at low frequencies: $$B{\nu}(T)=\frac{2kT\nu^2}{c^2}$$ with $T$ the temperature and $\nu$ the frequency. There are a couple of ways to derive it. One, requiring no explicit assumptions about the energy range ...
(more)
about 2 years ago
Question Is it possible to derive the Dieterici equation starting from assumptions about microstates?
I was introduced to a somewhat novel derivation of the ideal gas law that starts by thinking about the number of microstates of an ideal gas, $\Omega$. Say we have a gas with a single particle in a volume $V$. Doubling the volume should double the number of microstates, as it doubles the possible pos...
(more)
over 2 years ago
Answer A: What is semiholonomic?
Semi-holonomic constraints look something like the following: $$f(\mathbf{q},t)=\sum{i=1}^nfi(\mathbf{q},t)\dot{q}i+f0(\mathbf{q},t)=0$$ with the requirement that $f(\mathbf{q},t)$ be integrable. This expression should look a lot like the total time derivative of some function $F(\mathbf{q},t)$, if...
(more)
over 2 years ago
Answer A: What does Lagrangian actually represent?
There's not really a fundamental interpretation of the Lagrangian because the Lagrangian that describes the dynamics of a system isn't unique - more than one Lagrangian can yield the correct equations of motion. For instance, let's say we have a particle of mass $m$ experiencing a gravitational force...
(more)
over 2 years ago
Answer A: If planet 9 exists, is it correct to say that it is a "dark planet"?
There are perhaps two questions here. The first is whether the planet is intrinsically dark, i.e. it reflects only a small fraction of the light that reaches it from the Sun and emits only a small amount of blackbody radiation. This can be quantified by the planet's albedo, which depends on the compo...
(more)
over 2 years ago