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Apr
28
reviewed Approve Conservation Laws and Symmetry
Apr
27
comment Rotational Dynamics Question
As per the homework policy, you'll have to give us your attempt before we provide you with an answer.
Apr
25
reviewed Approve Milk or sugar first to maximize temperature of a hot cup of tea?
Apr
25
reviewed Edit Calculating the change in aceleration the earth feels when you push an object
Apr
25
revised Calculating the change in aceleration the earth feels when you push an object
Rendered Mathjax.
Apr
19
awarded  Custodian
Apr
16
reviewed Edit What exactly is the difference between radiation, conduction, and convection?
Apr
16
revised What exactly is the difference between radiation, conduction, and convection?
Changed title
Mar
22
reviewed Approve Is there absolute proof for gravitational waves?
Mar
17
reviewed Approve How do pressured containers within pressured containers behave?
Mar
15
comment Spin-1/2 with expectation values other than $\hbar/2$
You should be able to solve it with a superposition of eigenspinors.
Mar
10
comment Standing wave on a circle
Since you said "Nature tunes the wave", you should provide us with a specific example. I am not aware of any cases in real life where this happens. I mean, that's what the Bohr model is about, but that's just a model and all aspects of your conceptual understanding might not apply. Bruce Lee's answer is good, except maybe you wanted him to say "if the wavelength remained the same, we would no longer have a standing wave"?
Mar
10
awarded  Organizer
Mar
10
reviewed Edit Where can I find data for the masses/component velocities of galaxies in the Local Group?
Mar
10
revised Where can I find data for the masses/component velocities of galaxies in the Local Group?
tags modified
Mar
4
comment Do the LIGO observations constitute proof of a black hole merger, and what happened to the black holes?
In my view, your statement and mine are equivalent. When I say "our conclusions are perfect" I'm referring to how they explain the standard model of physics, generally. One could say "the errors are experimental and the model is true" or "the errors are in the model and the experimental results are true (or, better than the theoretical results)". I just wanted to point out that at this stage, we are in the first category.
Feb
28
awarded  Nice Answer
Feb
27
comment On the nature of forces in general relativity
I'm not sure I can clarify enough for an answer, but keep in mind that book is outdated, since it came out before the full development of QFT. The symmetries of the standard model do indeed change the geometry of spacetime, but not in a metric sense, because they are part of the fiber bundle "above" the 4-manifold where the metric lives.
Feb
25
reviewed Approve How do I calculate the perturbations to the metric determinant?
Feb
22
comment Do the LIGO observations constitute proof of a black hole merger, and what happened to the black holes?
mmmm we are getting off topic but I think the interpretation is not quite that either. The physical experiments might be imperfect, but the conclusions we draw are in some sense perfect. That is, we are not saying "GR correctly predicts gravitational waves from BH inspiral, except for a little part which could be due to something else", but rather "GR correctly [...]BH inspiral, and the small deviations are due to experimental errors"