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  • 0 posts edited
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  • 160 votes cast
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)?
Oct
5
comment Why does Dirac write $\langle\xi'|\overline{f(\xi)} = \overline f(\xi ')\langle\xi'|$?
@KyleKanos Dirac uses $\xi$ for a real linear operator, ' to label objects connected with eigenvalues-- $\xi'$ for an eigenvalue, $\langle\xi'|$ for an eigenbra
Oct
5
asked Why does Dirac write $\langle\xi'|\overline{f(\xi)} = \overline f(\xi ')\langle\xi'|$?
Sep
24
accepted How does Dirac conclude that $X_r(c_r)$ cannot vanish?
Sep
24
accepted What experiments compete with BICEP 2, and when are their results expected?
Sep
24
asked How does Dirac conclude that $X_r(c_r)$ cannot vanish?
Sep
23
accepted How does Dirac form this conjugate imaginary equation?
Sep
23
comment How does Dirac form this conjugate imaginary equation?
@ACuriousMind This is page 30 of his book where the basic mathematical framework is based around there being a function of a ket, amongst other things. You really need to have a look at the book to see what I mean.
Sep
22
asked How does Dirac form this conjugate imaginary equation?