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12h
comment EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
So these states are probabilities of it being measured to have some spin; this doesn't mean the spin upon creation is in a superposition of spin states, does it?
13h
comment EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
But aren't you using "state" here to mean the probability of what's measured?
13h
asked EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
1d
awarded  Inquisitive
1d
comment Does the total energy in an electromagnetic field depend on the acceleration of the sources?
@ACuriousMind I'm trying to understand where the self-force for an accelerated charge comes from. Since the self-force increases with acceleration I thought this might be because more electromagnetic energy is created.
1d
revised Does the total energy in an electromagnetic field depend on the acceleration of the sources?
edited title
1d
asked Does the total energy in an electromagnetic field depend on the acceleration of the sources?
Nov
15
comment What is a tensor?
"A (rank 2 contravariant) tensor is a vector of vectors": I like this picture! From the three numbers of a vector, we construct its length which is an invariant to rotations. Does something analogous exist for a rank 2 contravariant tensor wrt rotations?
Nov
12
comment Will a ball slide down a lumpy hill over the same path it rolls down the hill?
The difficult part is showing that the constraint for no slipping and its angular momentum doesn't affect the path taken by the center of mass when it's allowed to slip.
Nov
10
comment Will a ball slide down a lumpy hill over the same path it rolls down the hill?
@RonMaimon I've done a search on Amazon.com for that reference in your answer, but I can't find it; is it an old rare book?
Nov
1
awarded  Popular Question
Oct
27
accepted How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$?
Oct
27
revised How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$?
improve clarity
Oct
27
asked How to show that $(\xi\eta-\eta\xi)|A\rangle = 0$?
Oct
27
comment Reading the Feynman lectures in 2012
@ArtBrown I've seen the book on Amazon.com and after looking at the contents, I'm still scratching my head over the whole point of it: Physicists use QED, engineers use CED and both models are brilliantly served by main stream text books.
Oct
24
asked How does independence of the basic bras affect the choice of numbers used to represent a ket?
Oct
14
accepted Should the eigenkets be weighted in $|P\rangle = \sum\limits_{r}|\xi^r\rangle$?
Oct
13
comment Should the eigenkets be weighted in $|P\rangle = \sum\limits_{r}|\xi^r\rangle$?
every ket-vector can be expressed as a sum of a set of unity weighted eigenvectors? I find this hard to believe.
Oct
12
asked Should the eigenkets be weighted in $|P\rangle = \sum\limits_{r}|\xi^r\rangle$?
Oct
5
comment Why does Dirac write $\langle\xi'|\overline{f(\xi)} = \overline f(\xi ')\langle\xi'|$?
@KyleKanos Why doesn't Dirac just substitute $\xi'$ into $\overline{f(\xi)}$ as for (34)?