Application Definition and 945 Threads

I have a 400A (125VDC) charger that feeds a battery bank and a few DC panels (critical). This poor design has the panels being fed from the high side of a 600A breaker that is between the charger and battery bank. I need to take the battery off line for a load test but the problem I'm going to...

Homework Statement In his presentation of the de Broglie wavelength and the wave/particle duality, my quantum prof. has an exercise: "Find the de Broglie wavelength of a molecular vibration. Do quantum or classical laws apply?" Homework Equations wavelength = h/(momentum) ...

Hi all, the title I think says it all! Is there a list "out there" of PhD physics departments with the lowest application fees?

I wanted to create a GUI that would launch a series of .exe files My biggest problem right now is I do not know how to program the buttons to launch the executable files. I have done some coding with C# but never any GUI work and not sure how to start. I also wanted to see if there was...

Homework Statement A circular ring of radius a carries a uniform charge q C/m and is placed on x-y plane with axis same as z axis. To determine E at P(0,0,h). My ques is can't we apply gauss theorem? if yes then what will be the gaussian surface? if no then why not? Homework Equations...

1. A car, 5 km distance from a station, take 100 A over a 100 mm hard drawn copper trolley wire having a resistance of 0.270 ohm per km. The rail and ground return has a resistance of 0.06 ohm per km. If the station voltage is 750 V, what is the voltage of the car? Homework Equations I...

1.A large superball and a small superball are dropped from the same initial height H. Both balls bounce back up to a height h , which is just a bit less than H. If, however, the small superball is placed immediately above the large superball and both are dropped to the ground simultaneously from...

Hi :) i can finish my application by mid September but i will not have enough time to prepare for the verbal section of the GRE, how important is it? should i take an extra month to prepare for it ? how important is finishing an application early for graduate schools? some schools don't look...

Hi guys, I'm working on a keygen project on C++. Type is Win32 Console Application. For what I've learnt, I'm using stdio.h, conio.h, stdlib.h. time.h so everything is in printf and scanf (not using cin cout namespace std etc) So far I have not yet learned strcompare, dynamic memory so I have...

More and more I'm thinking that I'd like to do high energy physics in grad school. But at the same time I recognize that I'm not a genius and the competition is very stiff in high energy physics. So I'm wondering if applying to a particular school for their high energy program would make it...

I am about to talk to a prototype company and need some advice on O ring, friction and seals. I am creating a device that works on slight water pressure differential. I have a piston like structure that is cylindrical and there will be an o ring inside the cylinder. The gas/liquid that the o...

Homework Statement question 3 part b ( see attachment) Homework Equations thevenin theorem The Attempt at a Solution the answer should be 10.98v for Vth (thevenin equivalent voltage) all my attempts were unsuccessfull. I found voltages such as 22.2 volts i think I lake...

First off, I'm just learning the ropes of electricity, solar energy, batteries, wiring batteries in series and parallel, AC, DC, DC to AC Conversion and all that. But I do have the same need of energy as everyone else and a strong interest in finding ways to make my life a little less power...

I am trying to deploy my oceanic model currently runing on ubuntu linux and compiled with intel fortran on a cray sv1 machine with UNICOS operating system. It actually went quite well until i tried to read unformatted files. i am using the following code to export the data to the new machine...

Assuming I'm capable of passing the test to become a member of Mensa, do you think that it would be a sufficiently impressive addition to a physics graduate school application to be worth the cost (about $40, I think) and effort (a test in a nearby city) of becoming a member?

Homework Statement Assume that a pressure wave produces a change in pressure at a point in space \Delta P(t) which is proportional to a sawtooth function of frequency f = 1/2 Hz. (i) If the amplitude of the pressure wave is \Delta P_{0}, write down an expression for \Delta P(t). (ii) Two...

The Wikipedia article Divergence, in the section Application to The Wikipedia article Divergence, in the section [i]Application to Cartesian coordinates, says of the del-dot formula for divergence, "Although expressed in terms of coordinates, the result is invariant under orthogonal...

Homework Statement To measure how far below the ocean surface a bird dives to catch a fish, a scientist uses a method originated by Lord Kelvin. He dusts the interiors of plastic tubes with powdered sugar and then seals one end of each tube. He captures the bird at nighttime in its nest and...

1. Let f be the function given by f(x) = ex + 1, where the region R is bounded by the graph of f(x), the y-axis, and the horizontal line y=4. Homework Equations a. Find the area of region R. b. A vertical line x=h, where h>o is chosen so that the area of the region bounded by f(x), the y-axis...

Homework Statement http://img227.imageshack.us/img227/9792/hopitalsruleandlimits.png Ive added a picture of the question. I know that L'hopitals rule is lim x->a f(x)/g(x) = lim x->a f'(x)/g'(x) but I don't understand how to apply it in this situation >< and the other questions I don't...

Homework Statement The boundary of a lamina consists of the semicircles y = sqrt(1-x^2) and y = sqrt(4-x^2) together with the portion of the x-axis that join them. Find the center of mass of the lamina if the density at any point is proportional to its distance from the origin Homework...

This may be ridiculous, but here goes... I have a VOIP application on my desktop (for work) that I use at home with a simple headset with red and green speaker / microphone jacks. My standard 2-line speakerphone sitting next to my laptop at home obviously has a speaker and a microphone. Is...

Am really suprised when deriving electric field due to a uniform charged thin long rod! It was suprising to have a cylinder as a gausian surface! actualy is that posible, that all along the surface of the cylinder has same field intensity and why? also why are there no electric flux along...

Homework Statement From a load of 50 Panasonic tape recorders 35 are destined for L.A. and 15 are destined fro Miami. If two are shipped to Trenton by mistake and the "selection" is made at random, determine the probabilities that: a) both should have gone to L.A. b) one should have gone...

Homework Statement When an athlete throws a javelin her forearm snaps through an angle of approximately ¼ radians in 0.20 s. The athlete’s hand moves with approximately constant speed, the length of her forearm is 45 cm, and the combined mass of her forearm and javelin is 2.0 kg. Assuming...

Homework Statement A velocity selector consists of electric and magnetic fields described by the expressions vector E = E k-hat and vector B = B j-hat, with B = 0.0130 T. Find the value of E such that a 830 -eV electron moving along the negative x-axis is undeflected? Homework Equations...

Homework Statement A home security system costs $9/month in electricity costs (you may assume this is a fixed cost over the duration of the time involved in this question). A new security system costs $1500 to purchase and lasts for 8 years. Determine a rational function that gives the...

Hello, I am Year 10 student and would like to get help on the question below based on Boyle's Law. A piston with a block of mass 120 grams placed on it traps 200cm³ of air in a container. When the block is removed, the volume becomes 250cm³. Find the mass of the piston. In the question...

Homework Statement Find the value of k if the function y=x^2+kx+72 has a local minimum at x=4

I'm almost mid-way through a "licenciatura" degree in Argentina which is 5 years long. My current GPA would exclude me from any grad school (5.83/10), I believe. I plan on to get it up as much as I can, maybe I'll reach a 7/10 but sincerely I'm not that optimistic and I guess I'll end with a...

In my math class we are learning about inverse functions and how you can find if the inverse of a function is a function using the first derivative test. Our teacher omitted some of our homework regarding the derivatives of the inverse and he posed the question of how one would practically use...

Why is it that on many applications there is a section that asks whether you are a native american or some type of minority? Are they able to get into the university without working hard like many average Asians and Caucasians? If so why do they get this privilege?

Homework Statement Find a formula for when m \sum k=0 the flooring function of[k1/3 ] ,m is a positive integer. Homework Equations n\prod j=m aj The Attempt at a Solution the flooring function of[k1/3] = K the summation of K is \frac{m(m+1)}{2} There's a table of...

I am currently in school getting ready to start on the electrical engineering program. I decided on this major for quite a few reasons. One of them being the obvious technical skills I would learn as well as application to my interests in everyday life. Another reason is the challenge, I wasn't...

How the observed variation of specific heat of solid can be explained by Quantum theory?

Can't find the error I made... Rudimentary problem i know but i can't find where my mistake is... Homework Statement A nonconducting sphere is made of two layers. The innermost section has a radius of 6.0 cm and a uniform charge density of -5.0 C/m3. The outer layer has a uniform charge...

I guess GR is also needed to accurately coordinate space flight, but I highly doubt without GR the space shuttle will have any problem finding its way back home. Gravitational lensing doesn't count as practical application. Maybe a subject with even fewer applications is quantum chromodynamics...

not sure if anyone has seem this, but I think its a great way to add energy efficiency. http://www.msi.com/index.php?func=newsdesc&news_no=591 (and no i don't work for them) dr

Homework Statement Prove that if f is a meromorphic function f:\mathbb{C}\rightarrow\mathbb{C} with |f(z)|^5\leq |z|^6\quad\textrm{for all}\quad z\in\mathbb{C} Then f(z)=0 for all z\in\mathbb{C} Homework Equations Liouville's Theorem A bounded entire function is constant. The...

Title really says it all. I'm concerned because I do have a criminal record (getting a pardon very soon).

I have a first generation Apple iTouch 16 GB, and frequently download podcasts to watch and listen to. With over 1 million applications written, I have searched in vain to locate an application that will allow you to launch a video, and instead of displaying video and audio to suppress the...

I was just studyin kinematics and was wondering what its application in modern world would be, what are the recent scientific developments that uses the concepts of 1 dimensional motion. Can anyone make me get really interested into it by telling me about its applications??

Homework Statement Given a constant magnetic field, B, into the plane of the board, how much induced current flows through R and C. Homework Equations Induced EMF =-d/dt (Fluxb) Iind= Induced EMF/R V= dx/dt = constant (velocity of sliding conductor) Lenz Law The Attempt at a Solution

Homework Statement Two sides of a triangle have lengths a and b, and the angle between them is theta. What value of theta will maximize the triangle's area? (Hint: A=1/2absin(theta) The Attempt at a Solution I have a triangle drawn, with the base being a, and the height being b...

Hi, I am working on Mechanics by Landau and Lifgarbagez, and I have almost completed section 10 on mechanical similarity (in Volume 1, 3rd edition). However, I'm having some difficulty solving the problems at the end of the section. I have tried both of them, and I even found the correct...

Homework Statement Please tell me about NMOS and PMOS, What are their Structure and Application Homework Equations The Attempt at a Solution

Not sure where to put this, but if it's wrong, sorry... I just looked at the Nieto, Anderson paper on arXiv: arXiv:0907.3418 "Earth Flyby Anomalies" Funnily enough, it's about anomalies in the velocity of probes doing Earth flybys! This has hit the scientific news (New Scientist this...

Hi, We would like to connect an amplifier to produce the appropriate alternative current for a high frequency actuating system. Who here knows where I can find an opamp with the following charachtristics: 1) Non-inverting 2) Amplifies an alternating input current 3 to 5 times 3) Works...

I'm currently applying to grad school for a masters in pure math, and saw that carnegie mellon has no application fee. Can you guys think of any other decent math grad programs that have no application fees?

Hello everyone, first time poster here. I've been a lurker for about a week, but finally decided to join because I cannot for the life of me figure out this problem. Homework Statement Zach has trouble with the Quotient Rule; he thinks that d/dx (f(x)/g(x)) = f′(x)/g′(x). On his last...