Path Definition and 1000 Threads

How would I calculate the centripetal acceleration of a car at any (every) point on an elliptical path? Assume the car's speedometer is showing a constant speed the entire time. Answer in terms of g forces, please. (And, I have never taken calculus). You could also assume zero g at...

Hello, I am a senior in high school, I am extremely unsure of what I should go into. I have already been accepted to 5 universities (2 tech schools), but I'm not sure what major I should choose. For a little background, I have a 3.6, 24 ACT, precalc is my current highest math and I took 1...

I would like to determine the equation describing the trajectory of an object using data from 2 distance sensors. I figured out how to do this if the sensors take simultaneous measurements but this cannot be done without generating crass talk between the sensors. The object moves too far when...

It's really a question of whether research is for me or not. I don't know the answer because I haven't had a chance to research full time. I hope Physics forum may give me some guidance and advice. I am a sophomore in college majoring in Computational Physics, because I love Physics and I like...

I am 18 years old, going to a 2 year college to get my diploma and transfer to a University that does Computer Science, but I do not know if that is the right path..? I do not mind programming and Computer Science, but I have had more of a passion with Astronomy since I was a kid. I do not see...

Homework Statement 2. Consider a stationary circular spool of thread of radius R. Assume the end of the thread is initially located at (0; R). While keeping the thread taut, the thread is unwound in a clockwise direction. (a) Parameterize the path described by the end of the thread as r(t) =...

The mean free path is usually determined via the scattering cross section σ; one starts with a differential equation for the intensity dI(x)= -n\,\sigma\,I(x)\,dx Are there generalizations for this derivation for energy-dependent cross sections σ(E)?

I meant Line integral. Homework Statement I want to find the path integral of a vector function F over a closed path in Euclidean space with z = 0. Homework Equations The Attempt at a Solution I was wondering if it is allowed to first use Stoke's theorem and then Green's theorem. I would...

Path Integral Formalism Reading through Shankar atm, up to page 232/233. Reference to pages if interested. http://books.google.co.nz/books?id=2zypV5EbKuIC&printsec=frontcover&source=gbs_vpt_reviews#v=onepage&q=232&f=false(sorry I am too noob at latex to type all the formulas out..) It's...

http://img838.imageshack.us/img838/1538/physicsforumquestion.png Say "A" is a river. It is a linear approximation because only several coordinate points are known. The total length is "l" (obtained from the coordinates), "a" represents the distance from the river at which the soil is...

I have some confusions identifying the following objects: (1)Some transition amplitude involving time evolution(Peskin page 281, eqn 9.14): \langle\phi_b(\mathbf x)|e^{-iHT}|\phi_a(\mathbf x)\rangle=\int{\cal D\phi \;exp[i\int d^4x\cal L]} (2)Partition function(after wick rotation)...

In general I find in books that the path integral approach is an equivalent alternative of the hamiltonian approach for QFT (and for QT in general, but my concern is with QFT). There I usually find that this method is usually developed in a formal way and used to derive Feynman rules, gauge...

Hello Folks I have a program code in Fortran f90, that program generate an output file and put that into the same directory where the program resides, I need to put that output file in a network path ex: \\server_name\resource_shared I will appreciate if you could provide me the commands...

Hi all, as a complete noob, I must first ask that people understand that I have only a layman's understanding of cosmology. However, after watching a few of Brian Cox's lectures on entropy and the heat death of the universe, I had a rather interesting thought (although as I am not a...

Actually,. What is optical equivalent path.,.? Is this and optical path length are same,.,.,??

I am 23 and have not been to college. I am currently working as a technician and panel builder for a small company that engineers and builds automation control systems. This is a decent job, but I feel underpaid due to lack of training, and want to step towards a field I'm personally...

When there's magnetic field, a charged particle moves in a circle. I would like to ask why won't the circle goes smaller even when there's a force pointing inward (towards the center of the circle). Thank you!

Homework Statement http://s2.ipicture.ru/uploads/20120117/ReWSCD1f.jpg The attempt at a solution \frac{\partial P}{\partial y}=\frac{2y}{x^3} \frac{\partial Q}{\partial x}=\frac{2y}{x^3} \frac{\partial Q}{\partial x}=\frac{\partial P}{\partial y} According to my notes: Both functions are...

In de Broglie–Bohm theory (or should we say hypothesis): the wavefunction travels through both slits, but each particle has a well-defined trajectory and passes through exactly one of the slits. The wave function interferes with itself and guides the particles in such a way that the particles...

During high school I messed around and it wasn't until senior year that I started to get into mechanics and electronics, things that I never specially did before. My entire life I was the type of person to take things apart to see how they worked, played with legos and had an interest in the way...

This is a very silly question but anyway. When using a remote for a TV or digital channel receiver, how big is the path/signal emitted from the remote when a button is pushed. Will it come from a point, thee emitter, and form a cone shape until its picked up by the receiver. its a dull...

Alright, I have a kind of dumb question: Why do I distinguish between dq and dqi when considering the propagation from qi to q to qf? For example, if we want the wave function at some qf and tf given qi and ti, we may write: ψ(qf,tf)=∫K(qftf;qiti)ψ(qi,ti)dqi Why do we distinguish between dqi...

What is the Mean Free Path of water in it's liquid state? Just wondering how far an electron could travel in water before a collision?

I could use some help filling in the details of my poorly-planned career path. B.S. in Mathematics --------> ? ---------> ? ----------> ? -----------> Financial Modeling Where I am now: About 3/4 of the way through my undergraduate Math degree, having switched from the "Comprehensive"...

Alright, so I was wondering if anyone could help me figure out from one step to the next... So we have defined |qt>=exp(iHt/\hbar)|q> and we divide some interval up into pieces of duration τ Then we consider <q_{j+1}t_{j+1}|q_{j}t_{j}> =<q_{j+1}|e-iHτ/\hbar|q_{j}>...

Hello there! Sorry for the dumb question, but for years I have been very curious and confused about this: I just read that they discovered a galaxy 13.7 Bn light-years away -- therefore its light was emitted 13.7 Bn years ago and traveled 13.7 Bn light-years in some line. But, 13.7 Bn years...

Assuming we could understand all the laws of physics and understand all forces that exist in our universe, does the universe have a definite path? Could we theoretically calculate the result of all the properties of the universe to determine exactly how everything in the universe would behave...

I know this is not possible but I want to know why. Why cannot a directional photon (or electron) detector placed on the screen of a 2 slit experiment detect which slit an individual photon comes from without destroying the fringes? Fire the photons one at a time. They can be detected...

parabolic path at constant speed? (having issues) I found a brief mention of this problem at a few web sites. An object follows a parabolic path at constant speed. I'm having some issues with the math involved: Assume the path is defined by y = 1/2 x2, and that the constant speed is c...

Hi everyone, Yes I am a newbie here so forgive me if I don't ask the question correctly. I am trying to understand how to determine the minimal and maximum path length based on gas absorption. I know this is based on Beer Lamberts Law but I am not sure which formulas to use and the...

Hello, I am a 2nd year undergraduate student BSc (Hons) Physics at QMUL and simultaneously I am undertaking a BSc (Hons) in psychology with the Open University. I intend to proceed with an MSc and a PhD before I head out for a career. It's been a few months that I have started researching...

Homework Statement a.) A hiker is climbing a mountain whose height is z = 1000 - 2x**2 - 3y**2. When he is at the point (1,1,995) in what direction should he move in order to ascent as rapidly as possible? b.) If he continues along a path of steepest ascent, obtain the equation of the curve...

Hello, this will be my first post on the physics forum, so i wanted to make it decent :P I've been trying recently to derive for myself a path integral formulation (not quantum mechanical or anything feynman like but for finding the length of a curve on a given interval). Heres my attempt at...

I am one semester away from graduating with an operations research major. I only learned programming when I was in university, but grew to love it very much. Since I am currently considering my future, I realized that I am nowhere qualified for a job in the technology sector, so my first job...

I'm currently a weather forecaster for the US Air Force with my Community College of The Air Force Degree (equal to an associates) in Weather Technology. I would like to use my current knowledge to become an Earth Science teacher for grades 7-12. I currently live in Tucson, AZ and right now can...

Homework Statement [PLAIN]http://img214.imageshack.us/img214/194/calcdr.jpg I need to find the optimal path across two points, in two straight line segments. The speed from point A to B is 12ft/s, and 4ft/s from point B to C. Homework Equations The Attempt at a Solution I set...

A bee goes from its hive in a spiral path given in plane polar coordinates by r = b*ekt , θ = ct, where b, k, c are positive constants. Show that the angle between the velocity vector and the acceleration vector remains constant as the bee moves outward. (Hint: Find v · a/va.) attempts...

Hi. I did my undergraduate work in mechanical engineering and I am working on a PhD in fluid mechanics right now. I am interested in expanding my mathematical toolbox to include topology and am looking for some advice on where to start. What subjects/topics should I cover as a prerequisite to...

I am a first year engineering student at Purdue and I don't know which path I want to go down. I know I want to do something with a direct real wold application, so no math, physics etc majors. I do want a degree in the sciences and I want a job with stability, good pay, and some contact with...

Hey guys, as I stated in another thread, I'm a business/finance major and it's really too late for me to apply for a switch. I can drop my physics minor though (which would give me EXTREMELY shallow knowledge) and keep my math minor, taking enough classes for me to essentially have a major in...

Please teach me this: I do not understand why we call functional integral procedure in QFT being ''quantization'' procedure.Because the integration is the ''summing up'' procedure,but not ''dividing'' into ''quantum'' procedure.Or does this term(quantization) has a origin of being able to...

I'm trying to create some kind of demo that rushes through a tunnel. I have made a random path generator that creates smooth looking paths in 3D space (just some 3D points) Now I would like to create polies that form a tunnel around that path. To give an example, let us assume that the path...

Hi friends, sorry that i have posted so many threads recently regarding complex analysis. i am trying hard to understand as much as possible.anyway i was wondering if anyone had any good geometric interpretation for the equivalence between a differential being exact and it being path...

Compute the path integral where f(x,y,z) = x^2 and the path C is the intersection of the sphere x^2+y^2+z^2=1 and the plane x+y+z=0. I found the intersection to be x+y-(1/sqrt(2))=0 (not sure if that's right) but I am not sure how to parametrize it in terms of t. Any help would be appreciated.

Hi experts what is line integral - for example if I can draw graph of parabola and i can calculate the area under the graph. But how can i measure the length of parabolic path.

Hi all, I am currently having trouble with an exercise: writing the propagator of a particle coupled to a magnetic field. So the lagrangian is L_A (\vec{x},\dot{\vec{x}}^2) = \frac{m}{2}\dot{\vec{x}} + e\vec{A}.\dot{\vec{x}} And it says that I should solve it in two different ways: -by writing...

Homework Statement Two infinitely long current carrying wires run into the page as indicated. Consider a closed triangular path that runs from point 1 to point 2 to point 3 and back to point 1 as shown. Which of the following plots best shows B•dl as a function of position along the closed...

Hello, I am trying to solve the following problem using Mathematica: I have (defined) a surface of two variables, say f(a,b). Now I want to plot a path (a line) that corresponds to min[f(a,b)] starting from certain valus of a and b (say a0,b0). In other words the path always proceeds...

Homework Statement you are making a circular turn in your car when you hit a patch of ice causing friction to be zero, while the car is on the ice it: a continues to follow the circular path but with a larger radius than before b moves along a path that is neither straight or sircular c...

Watching this lecture from nptel about NP completeness: http://www.youtube.com/watch?v=76n4BjlL1cs&feature=player_embedded -We have an algorithm, HC , which given a graph tells us whether or not it has a hamiltonian cycle. -We want to use it in order to create an algorithm that determines...