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Mar
9
comment Relation between satellites' potential energy and quantum mechanical confinement energy?
I got the equation from Cheng and Warner's (excellent but) fairly non-rigorous introduction to QM, so your answer's much appreciated. Thank you!
Mar
9
comment Relation between satellites' potential energy and quantum mechanical confinement energy?
I did guess that it was probably integer multiples of $\hbar$ (although, yes, it's not true unless $l^2+l$ is a perfect square).
Mar
9
asked Relation between satellites' potential energy and quantum mechanical confinement energy?
Mar
4
comment Does a ball thrown in the air really stop at its apex, and if it does, wouldn't that violate the uncertainty principle?
Experts only ever state this as an approximation.
Feb
2
comment Why does 'proper length' exist as a notion?
Thanks for the edit. It reminded me that there's no smooth transition between proper length and time. The discontinuity itself is enough to abandon dreams of unification.
Feb
2
accepted Why does 'proper length' exist as a notion?
Feb
2
revised Why does 'proper length' exist as a notion?
deleted 1 characters in body
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/wire?
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/wire?
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/wire?
@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/wire?
@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/wire?