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Feb
2
revised Why does 'proper length' exist as a notion?
deleted 1 characters in body
Feb
2
asked Why does 'proper length' exist as a notion?
Jan
30
awarded  Citizen Patrol
Jan
22
comment Shape of a string/chain/cable/rope?
I think I understand now- I made a mistake having the integral within the integral.
Jan
22
comment Shape of a string/chain/cable/rope?
And also I'm getting stuck on differentiating $\int_0^l ds$ with respect to $\dot{h}$.
Jan
22
comment Shape of a string/chain/cable/rope?
@nervxxx, as a sanity check, is $\lambda= \frac{g \rho}{l}$ correct?
Jan
19
accepted How much effect does the Bernoulli effect have on lift?
Jan
19
comment How much effect does the Bernoulli effect have on lift?
Thank you! Maybe include that in the answer?
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@MikeDunlavey: I think I didn't say it correctly or coherently there, but is it possible to compare the magnitudes of the lift produced due to the difference in pressure, meaning the force on the underside to be > the force on the top (Bernoulli), and the lift produced by the angle of attack causing the downward motion of the outgoing air, thus lifting the plane? I'd have thought that it is, as are separate phenomena (as there is no 'larger thing'), even if fundamentally caused by the same thing.
Jan
18
comment How much effect does the Bernoulli effect have on lift?
The second link seems to imply that conservation of momentum and Bernoulli are a facet of (or different ways of looking at) a larger thing (that thing is not the sum of them, as I understand, as they aren't cumulative). What is this larger thing?
Jan
17
asked How much effect does the Bernoulli effect have on lift?
Jan
17
comment Shape of a string/chain/cable/rope?
@nervxxx, I was thinking of a bog-standard piece of string, so it's not large enough to experience the effects of a varying gravitational field. I wasn't getting stuck on anything particular; I just wanted to know whether I was correct up to here (I'll edit or comment if I hit a roadblock again).
Jan
17
asked Shape of a string/chain/cable/rope?
Jan
5
accepted Application of Heisenberg's uncertainty principle
Jan
5
comment Application of Heisenberg's uncertainty principle
$k$ is varying with respect to $n$, right? And isn't $k=\frac{\pi n}{L}$, so why is its variance equal to itself?
Jan
5
comment Application of Heisenberg's uncertainty principle
Unless the variance of $k$ is linear wrt $k$, then it just seems to be missing a factor of $2$.
Jan
5
comment Application of Heisenberg's uncertainty principle
Thank you, I'll stop using that useless term. Why do you use the wavenumber $k(=\frac{2 \pi}{\lambda})$, rather than momentum, which I have seen written more? I assume it's something to do with $\lambda = \frac{h}{p}$, but I can't see it.
Jan
5
revised Application of Heisenberg's uncertainty principle
added 18 characters in body
Jan
5
asked Application of Heisenberg's uncertainty principle
Jan
4
awarded  Critic