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8h
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 $x' = x -Vt$
Apr
1
awarded  Popular Question
Mar
17
asked What experiments compete with BICEP 2, and when are their results expected?
Mar
16
comment Why do both plates of a capacitor have the same charge?
user41086's point is a good one. KCL is concerned about currents at a single node, not at multiple nodes.
Feb
13
comment Does the action and Lagrangian have identical symmetries and conserved quantities?
Welcome aboard. Maybe you could click on "tags" or "unanswered" at the top to answer the difficult questions and get your rep up.
Feb
6
comment What's the interpretation of Feynman's picture proof of Noether's Theorem?
awesome question!
Feb
6
answered What's the interpretation of Feynman's picture proof of Noether's Theorem?
Sep
26
accepted Why does a stationary force affect the conservation of momentum, but not the conservation of energy?
Sep
24
awarded  Popular Question