Recent content by spacebear2000

According to this exchange on physicsforums.com with hilbert2, hydrodynamic 3D flow problems are possible to solve because "there we treat the liquid as 'continuous matter', ignoring its molecular nature at microscopic scale...However, because the number of grid points in the discretized...

Recognizing this as a computational hurdle (and not a theoretical one) is somewhat assuring, given that we can frame it as an engineering challenge. Thanks again!

@hilbert2: Thank you. From whence does the difficulty of accurately simulating 3D water arise? I know this is a naive sort of question, though I want to make sure I understand to what extent we're talking about computer processing speed and to what extent we're talking about gaps in our...

I've been away from the forum for a while working on an interesting project developing an open source visualization system for spatial manifolds that have four dimensions. I have two primary lines of questioning that stem from this work. 1) I know that Gerris is an open source solution for...

While this may seem like a silly question, I had difficulty answering it completely. "If space is a vacuum, why aren't we somewhere else already?" If it is truly empty, devoid of any substance or mechanism whereby it might restrain or compell the action of an entity, what keeps entities...

Thank you, Ryan_m_b and Nugatory, for bearing with me on this. Having read the links and your offerings, let me see if I got it in these terms: Let's say I'm a launch pad technician stationed in the launch pad from which my two rockets head off in opposing directions. I am able to measure...

Ryan_m_b, thank you for using the terms of my example. I'm still pretty concrete about this stuff, so having an example helps. I think that part of what I may be getting hung up on (or part of what I'm not making clear) is the concept of speed as distance/time. For example, if I go .5 a light...

Thank you for the pointers. I suppose another way to phrase my inquiry (or to add a question to it) would be to ask if there might be a scenario in which a body A traveling away from a body B could do so such that light emitted from body B in the direction of body A would not eventually...

This may be old territory, but I am relatively (no pun intended) new to this stuff, so I apologize if I'm bringing up things that maybe I should have learned already or found among older posts. I have a little thought experiment that I would like your opinions on. Let's suppose we have a...

If I only experience the net field, doesn't that mean I would only experience positive, negative, or neutral charge at any given point in spacetime?

So if I'm a point at coordinates x,y,z at time t, I can be in a region of positive and negative charge simultaneously?

"So a negative electric field would mean that the vector is now pointing in the opposite direction as it was for the positive electric field." I'm trying to visualize this in spatial terms. Let's say we are holding a light-gun with a special scope that allows us to look down its barrel, as it...

Ah, thank you! And where do the quark's charges come from?

Why does the strength of an electrical field diminish with distance from its source whereas the amplitude and frequency of a beam of light do not vary, regardless of distance?

Electrons have no known substructure, right? ...And they have a negative charge. Protons have known substructures...and protons have a positive charge. From whence does the positive charge of a proton arise, if not from the charges of a proton's substructures per se (in the way an ion has...