Recent content by GreenLRan

I see. Thank you. I believe I was interpreting the Work equation wrong. The 1/2 in the work equation only comes about when you count each potential twice (then you need to divide by 2). I was not counting each potential twice and dividing by 2. Thanks!

Do you mean you don't see where the factor 2 in the denominator of the solution's answer comes from? I don't see where that comes from either. I am assuming that my solution was correct then?

Assume that the origin is at one of the points, then the potential between each pair (there will be 3 pairs) is V = q/(4πεa). Since there are three pairs the V shows up 3 times in the summation. Also in the summation according to the work equation I wrote above you must multiple by q. Hence W...

I'm studying for the physics GRE and am fairly poor with EM. 1. Homework Statement What is the work needed to assemble four point charges q into a regular tetrahedron of side length a? Homework Equations W = 1/2ΣqiV(ri) The Attempt at a Solution Assume that the origin is at one of the...

Great essay. I have a BS in aerospace engineering (minored in physics), and a MS in astronautical engineering. I've been studying for the physics GRE and plan to take it this winter. My question is: What (dis)advantage would I have in applying to a big physics school (MIT, CalTech, Stanford...

In my thought experiment (it seems that others have asked a similar question, but I have a more specific question in my list below), we have a physicist outside the event horizon of a black hole. He has many entangled particles and sends some into the black hole. Is / Could there be some...

I believe the projection ends up being a great circle, this makes sense to me now. If you're following a rhumb line, you're constantly keeping a fixed azimuth with respect to North (a longitude line), in reality that works the vector off target. I verified by converting from LLA coordinates to...

I have an object (A) at some altitude above the Earth ellipsoid, and a point (B) on the surface of the Earth. Since you're not confined to the surface of the Earth as you travel from A (at altitude), to B, I'm getting confused. If I were to create a (Cartesian) vector pointing from object...

Thanks for the info Mike. I eventually would like to get my Ph.D, yes. The thing is, I wouldn't mind getting another M.S. first if that was required. Hell, I would even go back and do undergrad again if I had to.

Hi, I finished my M.S. in Astronautical Engineering in 2010, B.S. in Aerospace Engineering in 2009 with a minor in physics, and am finding that the work I have been doing in the aerospace industry for the past 4 years is unfulfilling. I would like to focus on something more research...

Hi, I am preparing to publish an academic article on computational efficiency and image processing. In my work, I have come across what I can best describe as a non-square skew (symmetric or repeating) matrix (I know it can't be symmetric since it's non-square). Here are some examples of...

Homework Statement (See Attachment for image) Part 1) This system is a model of an actuator with internal springiness, also called a series-elastic actuator.The system naturally decomposes into two subsystems: i) the mass of the actuator m1 with viscous friction b1 due to sliding on the...

I have two subsystems that I'm trying to transform into the frequency domain, and trying to obtain the transfer function for each. I have an equation (for system 1) m\ddot{x} -k(x2-x1) - b*\dot{x}1 = f Since this is for system 1, when I take the laplace transform of it, do i have x2 as...

I know several languages (C++, Python, FORTRAN, etc..), but most of the programming I have done never has had any real/physical interaction with hardware. I've never used micro-controllers, and would like to start tinkering around in the robotics field. Can anyone suggest any good books to...

In class today, my professor said that you will never find a force that is a function of acceleration. Why is this? M\ddot{x}(t) = F(x,y,z,\dot{x},\dot{y},\dot{z},t) M\ddot{y}(t) = F(x,y,z,\dot{x},\dot{y},\dot{z},t) M\ddot{z}(t) = F(x,y,z,\dot{x},\dot{y},\dot{z},t) This is in a...