# David Zaslavsky

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bio website ellipsix.net location State College, PA age 27 member for 2 years, 6 months seen 2 hours ago profile views 7,326

I'm a fifth year graduate student in physics at Penn State University, doing research in high-energy particle phenomenology. I also have a hobby interest in computer programming.

You can find me on Google+ or Twitter. Or check out my blog and personal website!

For matters not related to Stack Exchange, I can be contacted by email at stack+physics@ellipsix.net.

# 7,492 Actions

 2h comment Finding the force of an object?Hi Jeremy, and welcome to Physics Stack Exchange! This is a site for conceptual questions about physics, not general homework help. If you can edit your question to ask about the specific physics concept that is giving you trouble, I'll be happy to reopen it. See our FAQ and homework policy for more information. 2h revised Finding the force of an object?put image inline and add homework tag 4h comment Where does the extra equation come from to determine the forces from an object on a table?It probably is, but it's a good question because you're asking about the specific concept that confuses you, not asking for an answer to the question. :-) 4h revised Where does the extra equation come from to determine the forces from an object on a table?improve title and tags 14h comment Newton's Laws QuestionJust because the tag exists doesn't mean anything with that tag is appropriate. Also, showing what you did isn't enough. You should also explain where you got stuck, what you tried to do but were unable to do, and why, and ask the specific conceptual question that kept you from progressing further in the problem. Basically, make it clear that you don't want to get us to do your work for you, and that all you need is a little clarification. 14h comment Newton's Laws QuestionHi Ofir - as Bzazz said, this is a site for conceptual questions about physics, not homework help. If you can edit your question to ask about the specific physics concept that is giving you trouble (and it meets our other guidelines) I'll be happy to reopen it. See our FAQ and homework policy for more information. 18h revised Is it intuitive that the conserved quantity from time symmetry is what we know as energy?improve title 20h comment Is there any place you can safely skydive without a parachute?Maybe the question could be rephrased to ask under what conditions, if any, a person would be able to do this. 21h comment How fast could a football drop?The problem is not about whether it's a homework question, it's that you haven't shown any effort to work on the problem yourself, and that you haven't picked out the part you're confused about. Don't ask us to solve a problem for you, ask for a clarification on a concept. 21h comment Electric dipole moment, which charge is the $q$ for?@Anuar that should be an answer 1d revised Physical interpretation of changing variables $S(T,V)$ to $S(T,p)$put equations inline 1d comment How fast could a football drop?Hi Alex - this is a site for conceptual questions, not for homework help. If you edit the question to explain what you've tried and what concept is confusing you and ask about that, I'll be happy to reopen it. But just giving up and saying you're unable to solve it without trying anything is not enough. See our FAQ and homework policy for more information. 1d comment Violation of Newton's 3rd lawIs your question about colliding particles, or is it about two objects attracting each other from a distance? 1d comment Diameter of the universeActually the radius is more like 46 billion light years, though I'll leave it to a specialist to explain why. 1d comment physics (measurement)Hi Maryam, and welcome to Physics Stack Exchange! This is a site for conceptual physics questions, not for homework help. If you edit the question to show what you've tried and where you got stuck, and to ask about the specific physics concept that is giving you trouble, I'll be happy to reopen it. See our FAQ and homework policy for more information. 1d revised physics (measurement)edited tags 1d revised Does an elliptical orbit of a satellite maintain its orientation as the Earth revolves?fix title and add alt text 1d answered Why doesn't this equation for orbital motion change with position in the orbit? 1d revised Why doesn't this equation for orbital motion change with position in the orbit?edited title 1d comment What is the meaning of the concepts of “operator mixing” (and anomalous dimensions)@Dilaton "an example of what one wants to better understand from knowing these concepts" What concepts? That is the key issue. Right now the question asks to know "about the idea of 'operator mixing' and...anomalous dimension" but that is not a concept. What about operator mixing and anomalous dimensions does user6818 want to know? The definition? What they are used for? Some particular aspect of how they are used? That is what we need to wait for clarification on.