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Aug
11
awarded  Necromancer
Aug
8
reviewed Approve Is it easy to create a vacuum in space?
Aug
4
comment Why is Heisenberg uncertainty principle not valid in waves in string?
Is $\mu$ as you've defined it really the mean value of $f(x)$? I would say that it's the mean value of $x$, if $f(x)$ is interpreted as a probability amplitude.
Jul
28
reviewed Approve Why does a free-falling body experience no force despite accelerating?
Jul
28
reviewed Approve Why does a free-falling body experience no force despite accelerating?
Jul
14
comment Why do some types of waves disperse?
And before dives in with the full mathematical derivation of the dispersion relation, I think I'd add that a truly helpful answer to this question would provide some physical intuition for why the mathematics gives the result that it does.
Jul
9
reviewed Approve How is the degenerate electron gas state “degenerate”?
Jul
3
revised Does radiation force depend on group velocity or on phase velocity?
deleted 24 characters in body
Jul
3
revised Does radiation force depend on group velocity or on phase velocity?
added 61 characters in body
Jul
3
revised Does radiation force depend on group velocity or on phase velocity?
added 436 characters in body
Jul
3
comment Does radiation force depend on group velocity or on phase velocity?
Sorry, I thought it might have been clear from what I had already written, but I have updated the answer to be even more explicit.
Jul
3
revised Does radiation force depend on group velocity or on phase velocity?
added 839 characters in body
Jul
1
answered Does radiation force depend on group velocity or on phase velocity?
Jun
29
comment Does radiation force depend on group velocity or on phase velocity?
This is a great question. Here's a link to another discussion of a similar question -- I'm not sure how authoritative it is, though. quora.com/…
May
25
reviewed Reject Is it possible to express continuous growth without using transcendental numbers?
May
20
comment Angular momentum - proof for integer eigenvalues
I'm confused, how did you prove that j is a half-integer number? I thought it could either be an integer or a half integer (see my response here: physics.stackexchange.com/q/27899) . Once you've proven that for j, then I agree with you that the conclusion for m follows automatically from the 2nd statement in your question
Feb
20
comment A conical pendulum. A textbook claims one can start the circular motion in an unintuitive way
What I had in mind was the centrifugal force, the notorious "fictitious" force that appears in equations of motion when written down in a rotating frame. My thought was that if the centrifugal force were greater than the gravitational restoring force, then the slightly perturbed rotating pendulum would continue to move out. It's possible I'm overlooking something simple, though, especially considering that your experiment isn't confirming this idea. Maybe try again with a shorter string, and slightly larger initial perturbation?
Feb
20
comment A conical pendulum. A textbook claims one can start the circular motion in an unintuitive way
Neat! Your calculation seems correct to me. I would have thought the drill would be spinning faster than that, so I am a bit surprised. I'll have to ponder this some more. Also, ideally, your experiment should use an angular velocity that is not too much different from the pendulum frequency, so that the equilibrium angle is not so large that you enter the nonlinear regime.
Feb
20
answered A conical pendulum. A textbook claims one can start the circular motion in an unintuitive way
Jan
28
awarded  Yearling