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visits member for 3 years, 5 months
seen Dec 16 at 17:19

Aug
24
asked Is there a “forwards” and “backwards” in one dimension?
Aug
24
comment Physical reason for Lorentz Transformation
You're only looking at a light-like interval; you need to show how invariance of this implies invariance of space-like and time-like intervals also.
Aug
20
comment Rotation axis of a rigid body
+1 all this work, and just one lousy up-vote?
Aug
19
comment Why should multiplication of a ket vector by a complex number change only its “direction”?
@ACuriousMind A vector multiplied by a negative real number changes its direction, yes? How are we to interpret multiplying it by a complex number?
Aug
19
revised Why should multiplication of a ket vector by a complex number change only its “direction”?
improved context
Aug
19
comment Why should multiplication of a ket vector by a complex number change only its “direction”?
@Nathan I'm looking for an answer in the spirit of Dirac talking vaguely about vectors in an infinite dimensional space up to this point. I guess this will become clearer later on in the book, but Dirac seems to suggest this statement is obvious for physical/mathematical reasons.
Aug
19
asked Why should multiplication of a ket vector by a complex number change only its “direction”?
Aug
19
comment When is it useful to distinguish between vectors and pseudovectors in experimental & theoretical physics?
Cool, is there a book you can recommend which goes into this in more detail?
Jul
23
comment What is a tensor?
A tensor is a geometrical object whose components transform like that of a tensor.
Jul
13
awarded  Yearling
Jul
11
comment How does the speed of electrons change around a circuit?
The drift velocity is typically around a few centimeters/hour.
Jul
2
awarded  Curious
Jun
27
awarded  Popular Question
Jun
13
comment Why Lorentz Transformation in Special Relativity has to be like this?
You've thought about this before, right?
Jun
13
accepted Why isn't there a limit for a Euclidean rotation, as for a Minkowski rotation?
Jun
12
asked Why isn't there a limit for a Euclidean rotation, as for a Minkowski rotation?
May
15
awarded  Nice Question
May
2
comment What transformation is the metric of general relativity invariant under?
@Siva Tullio Levi-Civita does both in his original book. I get the feeling that physicists skimmed over it, and just took out the bit defining a tensor as having components transforming in a certain way.
Apr
30
answered Can the equivalence principle be shown to follow from special relativity?
Apr
11
comment Invariance of Lagrange on addition of total time derivative of a function of coordiantes and time
There isn't an absolute path in Galilean mechanics, the paths ARE different in the two frames where $x' = x -Vt$