Path Definition and 1000 Threads

I know that every once in a while, people get upset over just about anything. For us Math and Physics majors, this may be even more serious since our goals (and I know I am being biased here) are greater than other professions say, medical students, even if our stress level are relatively...

I am in a crisis of career path! please some light. Hello. I am in a crisis, i want a career in which i could work with renewable energys and something that really benefits society. I was thinking in electrical engineering becouse i enjoy physics and the practical part of mathematics, I am not...

Homework Statement \omega_{x} = \omega \omega_{y} = \omega + \epsilon where 0 < \epsilon<<\omega Question: Find the path equation. Homework Equations I started with the 2D equations: x(t) = A_{x}cos(\omega_{x}t + \phi_{x}) y(t) = A_{y}cos(\omega_{y}t + \phi_{y}) The Attempt at a Solution...

We all know that Galaxies are moving away from each other at a great speed, Is there any specific path through which they are moving? Again we know few things about the Universe like Moons rotate around Planets, Planets around star, stars around the center of galaxy. And it seems all follow a...

Homework Statement Find the work done by force F from (0,0,0) to (1,1,1). F=3yi+2xj+4zk The path C_3 U C_4 consisting of the line segment from (0,0,0) to (1,1,0) followed by the segment (1,1,0) to (1,1,1) Homework Equations None The Attempt at a Solution I am trying to find...

Hi everyone, I started what I thought would be a simple algebra/trig problem and quickly learned that I was dead wrong. At least I think I am wrong. I need to determine how much the speed of a particle moving along an arc segment changes as the length of the distance to the center point...

A pilot flies with a heading of 160 degrees and an airspeed of 250km/h. a)how long should it take the pilot to fly to a town that is 1200km away on the heading he has chosen b) there is a steady wind of 30km/h from the drection 030 degrees. Calculate the ground velocity c) How far, and...

Homework Statement An airplane in a wide "outside" loop can create an apparent zero eight inside the aircraft cabin. What must be the radius of curvature of the flight path for an aircraft moving at 749 km/h to create a condition of weightlessness inside the aircraft? Assume the acceleration...

A magnetic field curves the path of a charged particle for example the electron.So the application of a magnetic field should curve the path of the free electrons between successive collisions[More conspicuously for a large magnetic field].The"free path" of an electron then is no more a straight...

Homework Statement The mean free path for an ideal collisional gas can be calculated as shown on thishttp://hyperphysics.phy-astr.gsu.edu/hbase/Kinetic/menfre.html" . I understand the derivation, except for one thing. Homework Equations The Attempt at a Solution The molecule is...

I'm working on tracing the beam path of a HeNe laser through two prisms, and I'm stuck on trying to find the incident plane in which to use Snell's law. Basically I have the equation of the angled surface of the prism, and I have the point where the beam intersects that plane. Now I need the...

Hey folks, i have a question concerning canonical and path integral quantization. From what I have understood so far, these two techniques are different and independent but equivalent. My problem is that I don't really see where the quantum character enters in the path intregral formulation...

Hi all, I have an exceptionally basic question, taken from P21 of Zee. Eq. 14 is Z=\int D\psi e^{i\int d^4x(\frac{1}{2}[(\partial\psi )^2-m^2\psi^2] + J\psi)} The statement is then made that 'Integrating by parts under the \int d^4x' leads to Eq. 15: Z=\int D\psi e^{i\int...

A positivley charged particle is traveling in a straight line with velocity v at a small angle from the horizontal. At a certain instant a constant uniform electrical field is applied in the downward vertical. what is the direction of the charged particle? I figured that the equation for a...

Homework Statement An Electron is accelerated through a potential difference of 5.0KV (i) Find it's velocity. (ii) It is then passed through a region of transverse magnetic field where it moves in a circular path of radius 0.20m. Find the magnititude of the field. (iii) Find the time taken...

Homework Statement Consider path given by equation ( x - 1 )^2 + ( y - 1 ) ^2 = 1 that connect the points A = ( 0 , 1 ) and B = ( 1 , 0 ) in xy plane ( shown in image attached ). A bead falling under influence of gravity from a point A to point B along a curve is given by...

Homework Statement Sorry if this is the wrong section. Please redirect me if there is a more appropriate one. I'm looking at the timing spread in the time of flight of photons through fibers in a fiber optic faceplate. Essentially the minimum time for photons to propagate through one of the...

My real analysis book says that a path from two points p, q in a metric space M is a continuous function f: [a,b] --> M such that f(a) = p and f(b) = q, for some a and some b. But when I read other definitions, it says a path from two points p, q in a metric space M is a continuous function f...

Why does work done by a conservative force = 0 in a closed path? I know this sounds foolish :rolleyes: but how can some forces have such a property? Can anybody give a satisfactory physical explanation?:confused:

If I understand correctly--a big if--the path integration method, at least when applied to plain old QM, is described as (1) every possible path the particle could take is assigned an amplitude, (2) sum up (integrate over) these amplitudes for all possible paths. The problem I have with this...

Research Proposal: Sub-Orbital & Orbital Flight Path *Brain-storm Ideas With Me* *Light "imagineering" should be okay on this thread. I don't require anything that technical, mostly just ideas.* I'm in a technical writing class which is giving me the opportunity to work on grant...

Homework Statement At the end of the lecture in http://ocw.mit.edu/OcwWeb/Physics/8-01Physics-IFall1999/VideoLectures/detail/embed13.htm , Prof. Walter Lewin compares the motion of a slider on a circular air track (no friction) with the motion of a ball on a circular path (with friction)...

Homework Statement Find the B-field at the center of the square loop located above the xy plane, with width (w), and current I rotating counter-clockwise. Homework Equations Here is the given equation: B = [(μo*I*aФ)/(4∏*ρ)](cosα2 – cosα1) The final answer is for the B-field about...

Does the math of the Feynman path integral dictate particles taking many paths or is that just an english language gloss-over? Thanks, Jake

Hi, What is the linear acceleration of a body moving in a circular path? its written in my book that its zero since the magnitude of velocity is constant BUT the direction is changed so it can't be zero so this didn't persuade me. Also I DUNNO the difference between the linear...

How does a screen make a particle behave differently than a "detector"? I was reading a 2007 Newsweek article Putting Time in a (Leaky) Bottle. In one version of the double slit experiment, if you fire photons through double slits and have a screen on the other side, your results are a wave...

Homework Statement See the circuit in the attached image. Homework Equations N/A Consider the circuit given in the attached image, then please answer the following questions: 1. When the current will come out of the current source, will all that current will go through the path...

Hi, I have this problem about an object moving along a track due to a uniform gravitational field. It moves from being at rest in the higher position A (xA,yA) to the lower position B (xB,yB). There is no friction at all. What I am supposed to be doing is showing that the total time from A to B...

The best I could possibly get in with all my effort (whether this is be the #5 CS grad school in the nation, or #40, does not really matter.. as long as I take the most optimal path there and do it ethically). I was wondering what aspects the best/better CS grad schools look for in a college...

Hello, I am a Mechanical engineering student and I would really appreciate help with finishing a report I have to write. I have to interview mechanical engineers and ask them about their careers but I don't know that many (almost none) engineers in real life. The purpose of this report is to...

Homework Statement A ball whirls around in a vertical circle at the end of a string. The other end of the string is fixed at the center of the circle. Assuming that the total energy of the ball-Earth system remains constant, show that the tension in the string at the bottom is greater than the...

Hello, I am a Mechanical engineering student and I would really appreciate help with finishing a report I have to write. I have to interview mechanical engineers and ask them about their careers but I don't know that many (almost none) engineers in real life. The purpose of this report is to...

Homework Statement The expression for the mean free path in a gas of a particle with radius r is ((N/V)*pi*r^2*4*(2)^.5)^-1 in which N is the number of molecules, and V is the volume, and the factor of √2 in the denomiator accounts for the motion of the oncoming particles in the gas...

Hello everyone- My question is in regards to Theoretical Physics. Since my last post (which apparently was in Oct 2008...my goodness, I have learned so much since then), I was debating on whether or not I even wanted to go the physics route, but now here I am, a lot of math and two...

Path of Light Through a Circular (Spherical) Raindrop Homework Statement I need to draw an accurate diagram of a light ray's path through a circular raindrop. -The angle of incidence is 25degrees. -The radius is 4.15cm -n of water is ~1.33 -n of air is ~1.000293 I can calculate the...

if i know the speed and the radius of the turn how can I find the location of the object(x,y Cartesian) of the object with Time?

Homework Statement A particle is moving down a spiral path parameterized by: x = cos(au), y = sin(au), z = -u, where 0 \leq u \leq b (a,b real, >0). Starting from rest, the particle moves down the spiral under the influence of gravity and free from friction. Let g be the positive...

Homework Statement The following problem involve the setting up and solving of a first-order differential equation for a physical situation. Once, derived the equation itself is not difficult to solve. A boater rows across a straight river of constant width "w", always heading (i.e., pointing...

it comes from the calculus of variation that the shortest path between two points on a surface must be geodesic. then must the geodesic connected two points be the shortest path? if not, what about the example? Thanks for any reply!

Hello, i am studyig the special relativity for a while and actually mathematics isn't so difficult but cenceptually it's very unnatural to me.Anyway, first i want to ask about michelson morley experiment, in that experiment light beam which goes in a zigzag path, it's assumed that light goes...

In my estimation the clearest path to entropic gravity has been shown by Jerzy Kowalski-Glikman. His 4 February paper has some definite advantages over anything that came out since. http://arxiv.org/abs/1002.1035 Kowalski-Glikman, you remember, was the organizer at Wroclaw of the July 2009...

does the photon wavelenght come back to original when one path is "blocked"? Subject: Single particle (photon) interference in double slit or half silvered mirror experiment...question about wavelenght and phase shifts... in the half silvered mirror experiment or the double slit experiment...

OK, simple question, but I need clarification. When a projectile reaches its maximum height on its trajectory, it's vertical velocity is 0, but it's horizontal velocity is not, right? Because the horizontal velocity of a projectile (assuming a(x)=0, and a(y)=-g) is constant. Thus, the overall...

hi there i am hoping you will take only a few moments to answer a few questions for me that will help me. i am very interested in physics and maths i have no clue though about specialized areas, at the moment i am being asked to choose my subjects which will determine what i can study at...

I can't seem to understand the math. If I have a free electron in air, surrounded by an electric field, how do I determine and calculate the mean free path, the electric field strength, and the distance between plates required to impart an energy of 80 eV to the free electron?

Im in a competition and we need to build a robot that shoots 3 ping pong balls through 3 holes and then rounds the bases as if on a baseball field- there is a peg at each base it must knock down. Heres a link that shows the track on page 3...

Homework Statement When a rocket reaches an altitude of 40m it begins to travel along the parabolic path (y-40)^2=160x, where the coordinates are measured in meters. If the component of velocity in the vertical direction is constant at vy=180m\s, determine the magnitudes of the rockets...

Hello everyone, My name is Dave. I live in Louisiana and am currently attending a community college in the town that I live in. I am looking to transfer to a larger school in order to work to obtaining my E.E. degree. I cannot afford (not do I really wish) to go into a large amount of debt...

They seem so similar, at least in the research, Ph.D area. I am in grade 12 right now, the last year of high school. I am 100% willing to pursue a Ph.D down the road, as I know that is required for research jobs. Thank you.

In general, if S is a connected set, can I conclude that S must be path connected? Definition 1: S is connected if it is not disconnected. A set S is disconnected if it can be written as the union of two mutually separated sets, where mutually separated sets are two nonempty sets that do not...