Experimental nuclear and particle physicist. These days I'm teaching, but I've spent a lot of time on nucleon structure in fixed target electron scattering and neutrino oscillations using reactors and beam sources.

10h
comment Should I abandon my thought experiment about time?
The retardation of the signal (the technical word for what you describe here) is separate from time dilation and is not enough to explain what would be observed at high separation velocities.
11h
comment Why is Dr. Mahmoud nicknamed "Stinky?"
Pure speculation, but Dr. Mahmoud was educated in British school which are notorious for generating nicknames which stick with people (at least among their friends) after leaving school. Could just be a bit of color (or should that be colour?).
21h
awarded Nice Answer
1d
comment How do I limit randomness in KOTH challenge?
Random play is just part of the strategy landscape, there is nothing wrong with it and no need to limit it. If the challenge is no fun in the presence of random entries then the challenge needs work.
1d
comment Determine OS from a single command line operation
"(and I believe also OSX)" OS X is unix. With the (tm), none the less.
1d
comment What is logical way to calculate percentage error?
It's not of interest outside of teaching laboratories because there is a built in assumption that the right answer is known. Only, we're doing science and trying to learn something new (again once you get beyond leaning exercises in school). Real science has to find a way to quantify precision and uncertainty without reference to a predetermined correct value.
2d
comment What causes the recessed blade of some folding knives to emerge in a kinetic opening?
In at least some dvices the blade starts at a position of stable equilibrium where the centrifugal pseudoforce alone won't cause it to move, but the Euler pseudoforce that develops as you begin the motion is enough to pull it past equilibrium.
2d
comment Two carts connected by spring on frictionless track
Now this is the kind of homework related questions that is good for Physics SE.
2d
awarded Nice Answer
2d
comment Is the decay $B\rightarrow K^* \gamma$ decay allowed in the Standard Model?
The branching ratio quantifies it. Singly weak decays are much more common than doubly weak decays (by ratios of 10000:1 or more).
2d
comment Do we exist in multiple dimensions?
You just defined what you mean by "actually exist" by saying that it should actually exist. Define what consequences you think are required for an extra dimension to be "actual". I'm being persnickty about this because I sometimes get the idea that people asking this question don't have a clear idea what it means for a dimension to exist---especially in the context of string theory where the extras are currently presumed to be compact and small.
2d
comment Do we exist in multiple dimensions?
As usual, we'd need to know what you think "actually exist" means before we could answer this question even if we had string theory fully tested and the proper variant identified. Is it sufficient that the theory requires them?
Oct
22
comment Is the decay $B\rightarrow K^* \gamma$ decay allowed in the Standard Model?
Any two-W process is going to be weak-surpressed relative the dominate singly weak decays. Looking is the copy of the particle physics booklet on my desk I see some other double weak decay channels listed with branching ration limits in the $10^{-4}$--$10^{-6}$ range. The listed limit for decay to $K^0 l^+ l^-$ is $3 \times 10^{-7}$.
Oct
22
comment What does this community mean by students?
@Swapnil Writing a new question with essentially the same content will merely get you a question closed as a duplicate and an annoyed comment. You seem to be asking for hand-holding every time a new user shows up. That's not going to happen. Some thought has gone in to the closure messages (thought I am sure they could still be improved) so that we don't have to re-explain everything to every user. But that does rely on new users reading. Read the tour and read the closure messages.
Oct
22
comment Why are there still poor homework questions?
Stack Overflow also takes a dim view of simply transcribing homework-like questions, thought they frame their disapproval somewhat differently. But the ability of anyone to ask and answer without barrier has been a core part of the Stack Exchange model since the planning days (a deliberate difference vis a vis the ExpertsExchange), so it's unlikely to change.
Oct
22
comment What is the mass of the unstable particle?
Conserve four momentum and rely on the relationship between mass, energy and momentum.
Oct
22
comment Calculating the induced emf without knowing the change in magnetic flux
The problem expects you to engage on more than one level. You're doing fine employing Faraday's law, but you are also expected to deal with the problem in terms of energy.
Oct
22
comment What does this community mean by students?
Wow. That's some tough love. But, @Swapnil, Olin is doing you a favor by telling you how he judges things: it's giving you a honest taste of the way things are evaluated when you get out of school. Out in the "real" world your material lands in a big stack with everyone else's and the person who has to do the first sift through that pile is just itching to throw things away quickly. Little things matter.
Oct
22
comment Why are there still poor homework questions?
There are only a couple of dozen people who are really active in curating questions---maybe a dozen names that show up over and over again and some who pitch in when they are passing by. Why would you expect them to quickly catch them all?
Oct
22
comment What is logical way to calculate percentage error?
The place where working scientists bother with fractional error is in comparing the size of uncertainties: "neglecting the foo asymmetry is about a 2% error, and we're looking at about 5% counting error anyway so I think it is OK."
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