Application Definition and 998 Threads

Hi, Currently my wife and I are stuck in a two body problem with a separation of about 1500 miles. I have been looking for postdocs in her area (not many but a few more within a few hundred miles). My question is whether it is at all appropriate to mention the living situation and how getting...

Plz i want to know the practical applications of schrodinger's equation ??

Application of Gauss' law -- some doubts Homework Statement Revered Members, I have attached images of applications of Gauss' law namely 1) Electric field due to an infinitely long charged wire and 2) Electric field due to an infinite charged plane sheet. In both cases Gaussian surface is...

Homework Statement http://img593.imageshack.us/img593/5713/skjermbilde20111204kl11.png The Attempt at a Solution I thought it seemed appropriate to use divergence theorem here: I have, div F = 0 + 1 + x = 1+x I let that 0≤z≤c. If, x/a + y/b = 1then y=b(1-x/a) x/a +z/c = 1 then...

Homework Statement Let F(x, y, z) = \left ( e^{-y^2} + y^{1+x^2} +cos(z), -z, y \right) Let s Be the portion of the paraboloid y^2+z^2=4(x+1) for 0 \leq x \leq 3 and the portion of the sphere x^2 + y^2 +z^2 = 4 for x \leq 0 Find \iint\limits_s curl(\vec{F}) d \vec{s} Homework...

Hello, I'm intending to apply for an REU internship at Caltech for next summer, and I have a question that somebody American might be able to help me with. The application is an online application which asks for your name, address, programming languages etc. It seems like the application is...

I am applying to grad schools now, and I have a question on what I should be putting in the space that asks for GPA. I transferred from a community college, and some of my community college classes go back 11 years. The GPA I'm graduating with from my 4 year university only takes into...

Homework Statement I'm trying to include rigid body rotation in a problem I'm working on but can't seem to figure it out. Two shafts oriented vertically are connected by a thin cross member of length R. Holding one shaft stationary and applying a constant tangential load F to the other...

Quick one If I have an electric motor with a gear box (what ever ratio) and I want to install an electric holding brake will my holding power be greater if the brake is installed on the output shaft of the gearbox or the shaft of the driving motor to the gearbox ? my educated guess is that...

Homework Statement Find an equation of the line passing through the point (1, 4) such that the area of the triangle formed by this line and the positive coordinate axes is as small as possible. Homework Equations The Attempt at a Solution No idea where to start this one please...

Homework Statement We have to give the total charge, dipol and quadrupol moments of a charge constellation, but I seem to be falling at the first hurdle. Q = \frac{1}{4\pi \epsilon_{0}} \int_{vol} \rho(\vec{r}) d^{3}\vec{r} whereby the charge density of the group of particles is...

Help with graduate ChemE application! I really want to apply to MIT for the ChemE Phd program and apparently they look at your class rank quite a bit...I might not have a very good class rank, let alone be the top student! What are my chances going to be if I spend about 2.5 doing research and...

m using SciDAVis on a Athlon based system running Debian Linux. I am try to produce some graph of functions. The math part is working fine. However, when I try to change the axis labels, a blue box forms around the axis label and remains there. When I export the plot, the blue box is still...

This might be the wrong forum for this question, anyway here it is: I'm using SciDAVis on a Athlon based system running Debian Linux. I am try to produce some graph of functions. The math part is working fine. However, when I try to change the axis labels, a blue box forms around the axis...

Homework Statement I have a circular plate made of some metal and it is shaped like the equation x^2 + y^2 \leqslant 1 The temperature at any given point in this plate is given by the function T(x,y) = x^2 -x+2y^2 I'm supposed to find the hottest and the coldest points. Homework...

Homework Statement Two ships, A and B are sailing along straight routes with constant velocities. At 10 o clock morning, ship B is 8 nautical miles from A and its bearing from A is 315°. At 10.15 in the morning, ship B is 6 nautical miles from A and its bearing from A is 320°. Find the...

Hi. Which language is used in creating windows OS and it's application?

Homework Statement In a steam engine the pressure and volume of steam satisfy the equation PV1.4=k, where k is a constant. Calculate the work done by the engine (in ft/lbs) during a cycle when the steam starts at a pressure of 100 lb/in2 and a volume of 400in3 and expands to a volume of...

Homework Statement A turn in the road with a radius of 30m is banked at an angle of 40 degrees. If \mu=.75, what is the minimum and max speed a 1200 kg car can travel without sliding off the turn. Homework Equations F=ma, Mv^2/R, Fw = mg The Attempt at a Solution Alright, so...

Polynomial Function. Homework Statement f:ℝ→ℝ x→x^2+x+2 Homework Equations Prove that: f(ℝ)=[7/4,+∞[ The Attempt at a Solution Well I don't know how answer this, so can someone give me a clue on how to start it off?

Homework Statement A leaky 6lb bucket is lifted from the ground to a height of 30ft at a constant speed with a rope that weighs .5lb/ft. Initially, the bucket contains 60lbs of water, but the water leaks out at a constant rate and finishes draining just as the bucket reaches the 30ft level...

So I am wanting to start applying for PhDs for entry in Sept/Oct 2012, I graduated from Uni last year so I don't really have any guidance on this! I do have a good idea of what I want to apply to do, and have a list of places I would like to apply (saving this for another thread haha :) )...

Homework Statement A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the electric field at a point 19.0 cm ra- dially outward from its axis (measured from the midpoint of the shell) is 36.0 kN/C. Use approximate...

Homework Statement A ship moving at 8 mi per hour, Sails W for 2 hours, then turns N 30 E. A search light, placed at the starting point, follows the ship. Find how fast the light is rotating, (a) 3 hours after the start; (b) just after the turn. Homework Equations The Attempt at...

Homework Statement A hemispherical dome has a diameter of 100m. A search light was placed at point A as shown at the middle of the dome at B. A balloon was released vertically at a velocity of 4m/s. How fast will the shadow of the balloon move alone the roof if it traveled 25 m vertically...

Hi, Im currently working on a project to design a hybrid pulse-je/rocket motor for space applications. The Pulse jet is to lift a payload in the Earth's atmosphere then reverts to a rocket motor in space. The idea is to reduce the use of on-board oxygen during ascent since it initially...

Homework Statement A rocket burning it's onboard fuel while moving through space has a velocity v(t) and mass m(t) at time t. If the exhaust gasses escape with velocity ve relative to the rocket , it can be deduced from Newton's Second Law of Motion that...

Hey all, recently found this site about ball bearings and have a question: http://www.mcmaster.com/#standard-ball-and-roller-bearings/=ecllbn I have an application that will have a gear sit on top of the ball bearing as it spins (the weight won't be too large, don't want it to be), what...

Anyone knows how to get admission in MIT ??

I've just begun my 2nd year of study at my University and as part of a program requirement, must take a Liner Algebra course. I love mathematics, but I have never experienced much of Linear Algebra. I was just wondering how Linear Algebra applies to Physics, what branches, etc.

Homework Statement Two weights are hanging by the following cables, A, B, C. 1. Find the tension in Cable A. 2. Find the tension in Cables B and C. -----ceiling---------- \ 60) (60 / \ / \ / B \ / C \ / \ / [_]...

I'm a third year physics student interested in grad school. My marks are ok (85% average), and I should be able to get a letter of reference for grad school based on a 4th year Honours project. How important is a summer research position to a grad school application? I can probably get a...

Please teach me this: I hear that linear sigma model has application in pion,nuclear physics.But do not understand what is the application of nonlinear sigma model in QFT? Thank you very much in advance.

Let {xn}n = 1\infty be a bounded sequence and {xnj} be a convergent subsequence, each one converging to L. Want to show that {xn[}[/itex]n = 1\infty converges to L. My proof is as follows. Suppose that {xn}n = 1\infty does not converge to L; this implies that there is a...

A 5C point charge located at (2m, 3m, 4m) and a 6C point charge located at (4m, 3m, 2m) together exert a net force on a 7C point charge located at (2m, 4m, 3m) is most closely represented by... (a) k(-6i + 15j - 10k) N (b) k(-8i + 13j - 12k) N (c) k(7i + 14j - 11k) N (d) k(7i - 14j - 11k)...

are there any places (hopefully online since it'll be easier for me), where I can read examples of good UC application essays? (not just any essay, but essays that are picked as well written and posted public as an example). There're probably lot of essays out there, but it does not mention(in...

A 1450 kg submarine rises straight up toward the surface. Seawater exerts both an upward buoyant force of 16,140 N on the submarine and a downward resistive force of 1030 N.My question: Is the weight of the submarine included in the net force? If the weight is taken into account, is it included...

Homework Statement The stopping distance of a 0.40 kg weight which slides into a spring with k = 750 N/m at a speed of 1/2 m/s is 0.012 metres. Can we now calculate the original uncompressed length of the spring from this info? The Attempt at a Solution m = 0.4kg k = 750N/m v =...

Homework Statement An arctic hunter goes hunting polar bears and shoots one. He finds it lying dead on a large patch of almost frictionless ice. He has no scales or weighing device of any kind (and of course, there's nothing to hang it on) but he does have a long rope. How can he get a pretty...

Homework Statement My dad is driving coal. His truck has a limited coal-capacity, and enough fuel. He drives this coal from the central which has enough coal, to farmers that need different amounts. As there are many farmers, he has to drive back and forth several times. He knows all...

Is it possible to use a piezoelectric transformer to step up voltages of 3 to 12 volts to as much as 5 kilovolts? Below are more details of what I would like to do: Input into transformer: square waves, 0 to 12-volt amplitude with frequency range of 100 Hz to 100 KHz Output from transformer...

I start to learn about matrices and their algebra, but I am wondering what physical application they have. I know that matrices have application in optics, which is called “Matrix Optics”, but do they have other applications? Can you give different and real physical examples with matrix algebra...

I am your regular White guy and a Texan for 6 generations. The PhD application form asks for your place of birth. Now I was actually born in Mexico but soon after I was born, my mother married a guy from Romania and moved to Romania. He wanted to immigrate to the US, so he registered...

Greetings everyone, I'm constructing a ferrofluid display cell using FerroTech EFH1 ferrofluid inside of a round bottom pyrex beaker. The ferrofluid is oil based, so it is not hydrophilic. The liquid that the ferrofluid will be suspended in is Magnesium Citrate (a household laxative... and no...

1. The Ministry of Health has determined that t day after the detection of a communicable disease, the percent P of a city’s population that will be affected is given by the equation P (t) = 10te^-0.1t 1 ≤ t ≥ 15. How many days after detection will the maximum percent of the population are...

Homework Statement The apparatus below shows an experiment to investigate the speed of reaction between lithium and water. A piece of lithium is wrapped in steel gauze and placed in a beaker of ]water. The volume of gas collected in the measuring cylinder is measured at 10s time interval...

I have this example from my physics books which says: If a skater pushes against the wall and the skater moves, the wall does no work and the motion of the skater only results from the internal work of the skater. It also says that the wall does no work because there is no motion of its point...

Hi there, I joined specifically to ask for help in exploring the possibility of harvesting the waste heat from a cars engine and recycling this energy to improve the engines efficiency. I'm assuming most people know about thermo dynamics, internal combustion and volumetric efficiency I:-p...

Homework Statement I have proven in two ways (correctly) that the derivative of ln|x| = 1/x (note absolute value does vanish) Now I open my textbook and see a general rule that \frac{d}{dx} ln (u) = \frac{u'}{u} And the not so general derivative of |x| is \frac{d}{dx} |x| =...

I am looking forward to design vent silencer , which shall be temporarly connected to the 48'' pipeline for depressurising activites during gas pipeline pre comminissioning ativites. Dry air shall be injected into pipeline which shall proppel the pigs and move the water infort of the pigs for...