308 reputation
19
bio website
location
age
visits member for 2 years, 8 months
seen Jul 7 '13 at 6:03

Nov
21
awarded  Popular Question
Jul
7
comment Do photons have acceleration?
This doesn't really describe acceleration. Is there a point at which the velocity of the photon is half way between the velocity it travels through the two media? If not, the jump in velocity is discontinuous, is not differentiable, and so, cannot be described as having an acceleration.
Jul
7
comment Do photons have acceleration?
@BenCrowell: Of course. But it made for a shorter response and was only a little wrong.
Mar
26
awarded  Yearling
Feb
9
awarded  Critic
Feb
9
comment Thought experiment regarding an object approaching a mirror
The entire point of relativity is that c + v = relative velocity is completely wrong. Superman will always see light coming towards him at c.
Apr
21
comment Isn't the uncertainty principle just non-fundamental limitations in our current technology that could be removed in a more advanced civilization?
Uncertainty can be described in terms of commutation relations. This may not be an answer you're looking for, but it's a pointer that it exists in the maths if you start looking for it.
Apr
21
comment Isn't the uncertainty principle just non-fundamental limitations in our current technology that could be removed in a more advanced civilization?
If a tree falls in a forest that may or may not exist, does it make a wavefunction?
Apr
16
comment Work Done by Rockets in Orbital Motion
I figured an integral here would be too much detail for the required answer. And it doesn't really matter for such a simple potential.
Apr
13
revised Work Done by Rockets in Orbital Motion
Changed potential to negative value.
Apr
13
revised Work Done by Rockets in Orbital Motion
added 334 characters in body; added 20 characters in body
Apr
13
comment Work Done by Rockets in Orbital Motion
Hmm... I suppose a $g_{eff}$ would be more appropriate...
Apr
13
answered Work Done by Rockets in Orbital Motion
Apr
12
comment Does Polytetrafluoroethylene (Teflon) have low wind resistance?
I see. The short answer, I suppose, is no. At least not necessarily. Friction is due to microscopic factors while resistance in a fluid is mainly due to macroscopic factors.
Apr
12
awarded  Commentator
Apr
12
comment Does Polytetrafluoroethylene (Teflon) have low wind resistance?
Note: against any solid.
Apr
12
comment Why are alpha particles made of 2 protons and neutrons?
Because "isospin" and "spin singlet" requires a good bit of background knowledge. This graph gets the point across much more effectively.
Apr
12
answered How do we know that internal conversion creates no intermediate photon?
Apr
1
awarded  Scholar
Apr
1
accepted Why is light described by a null geodesic?