34,534 reputation
347118
bio website inspirehep.net/…
location Duchy of Grand Fenwick
age 43
visits member for 3 years, 11 months
seen 8 hours ago

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.


Oct
8
comment Avoid dependent equations when applying Kirchoff's Laws
@Floris Linearly dependent means the same thing that it does in a more conventional vector space. One of the equations can be written as a linear combination of the others (and yes, that implies that written in matrix form the determinate is zero). There are easy ways to avoid certain linear dependencies, but as far as I know avoiding them all requires some understanding of the particular system you are looking at.
Oct
7
comment Does a wave experiencing a total internal reflection penetrate the medium in any way?
Useful search phase "The frustration of total internal reflection".
Oct
7
comment How long must a sample be irradiated before all 59-Co atoms are converted to 60-Co?
What do you know about the rate at which individual conversions occur? What can you deduce from that?
Oct
7
comment What's the difference between hopping and tunneling?
"tends to overlap it's energetically allowed area" Did you mean "disallowed"?
Oct
7
comment What makes electrons lose energy?
Everything that is not forbidden is compulsory. --Quantum Mechanical Totalitarian
Oct
7
comment What makes electrons lose energy?
"Don't think of the electron, think of the entire system that contains the electron." Always an important point.
Oct
7
comment Changing Rotation Direction in Mid Air
See the DOI I put in the comments on the question, It has been addressed directly for divers.
Oct
7
comment Changing Rotation Direction in Mid Air
@KyleKanos See that paper I posted. Everyone who does twisters does, though they almost always have a the main component around one primary axis at a time. I did a 5223a for a while in high school, and that rotates both was at once for the whole dive.
Oct
7
comment Changing Rotation Direction in Mid Air
Of interest here: dx.doi.org/10.1119/1.11759 . It concerns spring-board divers, but the physics is roughly the same.
Oct
6
comment Advancement of perihelion, data
This is on-topic and welcome here on Physics SE, but it might do better on Astronomy. I could migrate it if you want.
Oct
6
comment Electromagnetic induction creates a current with a Lorentz force?
"And magnetic fields are straight lines from north to south pole" is an approximation. The field the bulges outward at the edges, and though the field is weak far from the magnet it has a lot of wire to work on...
Oct
6
comment Can a rigid body have three independent rotations, about three different, mutually perpendicular axes?
@DavidHammen You are right. I'm wrong. And I still haven't said what I meant to say.
Oct
5
comment Can a rigid body have three independent rotations, about three different, mutually perpendicular axes?
@DavidHammen I think perhaps you have misunderstood me---or I have not written what I thought I did. Any infinitesimal rotation can be described as a single infinitesimal rotation around a single axis (which takes 3 parameters, but can be conceived of as a "single" axis of rotation). A general finite rotation can also be described by three parameters, but can not be described by "we rotate by this amount around this single axis" the way the infinitesimal case can.
Oct
5
comment Can a rigid body have three independent rotations, about three different, mutually perpendicular axes?
You may be confusing two notions. Any combination of rotations may (over an infinitesimal period) be replaced with a single rotation about an appropriately chosen axis, but that does not mean that the general non-infinitesimal case can be expressed in that way.
Oct
5
comment Should I always include units at every step?
While you will sometimes see experts do this, it is bad advice for students. Keeping the units gives them clarity on what they are manipulating and provides a chance to catch mistakes.
Oct
5
revised Should I always include units at every step?
minor mathjax improvements
Oct
5
reviewed Edit suggested edit on Why do electrons in an atom occupy only the stationary states?
Oct
5
revised Why do electrons in an atom occupy only the stationary states?
Corrected misspellings
Oct
5
comment How much measurements are usually done to test CHSH inequality?
The first answer that comes to mind when the question is "Where i can find such [experimental details]?" is always "Why, in the paper of course." Have you read any of them?
Oct
4
comment How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago?
I think it is worth noting that the so called "ladder of distance" that is used to establish these things theses days has multiple paths which support and cross-check each other. Perhaps we should start calling it the "scaffold of distance".