Application Definition and 998 Threads

Can creation operators be used to find a matrix representation in a larger dimension? Is that maybe how I could find the 3D representation for SU(2) ?

Homework Statement Two equal and opposite charges (± q) start from positions ± y, respectively and move on the y-axis with constant velocity u, so that they approach symmetrically the axis origin. Using generalized Ampere's law find the magnetic field in any given point at the xz plane...

Here's yet another assigned problem that I'm having difficulty with. I think I'm close to the end but am "nervous" (for lack of a better word) about whether or not I have used summation notation properly throughout the problem. Here it is: "Use the Schwarz inequality to establish that (...

Need help solving these questions cheers This shape is the basis of the building you are trying to build which is an archway and a spire – rough drawing attached [Spire-lower component-the parabola in blue] Its vertex is 5m above ground level and touches the ground 4m to either side of it’s axis...

In the mathematics of Calculus, a basic requirement is that the system or function should be continuous. Until the discovery that matter is discontinuous, applying Calculus in Physics was reasonable. But why is it still applied almost everywhere in physics ? Won't such applications produce...

Dear All, I did post this issues in the physics forum, however there is somebody ask me to post it in the engineering forum. With this I re-post it here. Does anyone here familiar with a theory called Principal Virtual Work (Equilibrium theory) ? I read somewhere that with this theory, i...

Dear All, Does anyone here familiar with a theory called Principal Virtual Work (Equilibrium theory) ? I read somewhere that with this theory, i could relate(for pipeline application - collapse & buckling) the components for ovalisation, external pressure and hoop strain. Appreciate if...

Hello Physics Forums Community, I have just applied online for a post-bachelor's research assistant position at Los Alamos National Laboratory. Does anyone work there/have experience with them? I'm wondering what my next step should be. Are they going to contact me? Should I contact them...

in this problem I am trying to find the mean of the probability density function of c*e^(-c*t) and by doing so i am multiplying the function stated previously by the variable t, which i know is correct. after taking the anti derivative and evaluating using the limit. I get an indeterminate form...

Not sure about the strength of my grad application (MATH)... Hi all, Sorry to post another typical grad application question, but I really need some guidance on appropriate math grad schools I should apply to. My advisors don't seem to know much. Could anyone give me a rough idea of where I...

Homework Statement A mass of 40 g stretches a spring 10 cm. A damping device imparts a resistance to motion numerically equal to 560 (measured in dynes/(cm/s)) times the instantaneous velocity. Find the equation of motion if the mass is released from the equilibrium position with a downward...

urgent help regarding application of solar in conv. electric ckt hi there engg/experts I am having a project of applying 5 Kw photovoltaic along with conventional electric supply. The photovoltaic panel would be able to run 35-40 fans and cfls. The problem which i am facing is to club both the...

Hi, I have a small cylinder forcing a liquid up a 2.5mm inside diamter tube against gravity. The cyclinder is driven by a stepper motor and software. I have a problem, though outside my experience. (I am an electronic eng.) --- I need to seal the top of the liquid column, as it rises and...

I am confused about the counting of degrees of freedom. Yes, I know that it is the number of vectors which are free to vary. But that definition gives way to different interpretations: (1) the number of data points minus the number of independent variables. This seems to be the basis of the...

Homework Statement This is an engineering design application, but It contains integration. Sorry if I didnt post it in the right folder. I think a)'s answer should be (pgw)^2*h^2 h=r To be honest no Idea what is going on.. Thanks

hi i was wondering how would the results be different if we were to apply a force below the horizontal at a certain angle rather than above the horizontal.

I'm attempting to accumulate as many Application Notes from as many places as possible, and I would like some suggestions about where to get them. I've found them to be an enormously helpful supplement to the textbooks at school, sometimes explaining certain concepts clearly where the books...

1. Basically, I want to take a piece of hardware and do system programming by using C and C++ computer languages and I want to develop User Interface using C# in .Net framework. So, what I intend to do is I want to use Visual Studio Integrated Development Environment 2010 and develop user...

A well-known bug in vBulletin (the software of this forum) is the 50-character bug. Try this: Nowisthetimeforallgoodmentocometotheaidoftheircountry. This "word" is just over 50 characters long, and you can see that vBulletin forces a space in-between the n and the t of "country", right at the...

First of all sorry for my off-topic question here. I'm a computer science student, who has a high interest in mathematics (especially algebraic geometry), and physics (especially quantum mechanics, quantum field theory). For this semester I'm supposed to create to applications, from which one of...

I hope I managed to post my question the right place! I have a body consisting of a bunch of mass-points in ℝ^{3}, and when torque is applied to this body, I'm interested in finding the force that must have caused the torque based on the point of application and the torque vector, which are...

So I'm stuck resolving this integral... \int^{1}_{0} \sqrt{e^{2x} + 1} \, dx u=2x ; du=2dx \frac{1}{2}\int^{2}_{0} \sqrt{e^u + 1} \, du t=e^u+1 ; dt=e^u du \frac{1}{2}\int^{e^2 + 1}_{2} \frac{\sqrt{t}}{t-1} \, dt v=\sqrt{t} ; dv=\frac{1}{2\sqrt{t}} \int \frac{v^3}{v^2 -1} \, dv And here i...

Hello everyone! Searching for applications of artificial neural networks (ANNs) to real world problems, all I found were applications to computer science problems (e.g. face recognition, OCR, automated control of systems and machines etc.) and some very experimental works (e.g., crime forecast...

I've got a form to fill in for work experience over the summer and just wanted to ask a couple of really stupid questions (I haven't really filled in any proper serious application forms before) The form is available online as a word doc so would it be ok to fill it out on screen and print it...

On one application the employer asks about job history. Two questions are included which I have not come across before other than in an interview and I don't know how I should go about answering them. They are: What did you like most about this job? and What did you like least about this...

Here's the deal. Last year, my self esteem was down the drain. It still is, somewhat, but I'm in a much better place than I was last year, and it's getting progressively better. I started an application to a very small (less than 300 students) liberal arts college (not in the US; but it's...

I'm a mold inspector looking for an answer to gases from mold growing in wall cavities of a house. The issue is whether gases penetrate into room air (which I can test for) and what the best approach (short of gutting the house) is to reduce exposure to mold gases in the house. The two...

Homework Statement Calculate the resistance of this combination of resistorsHomework Equations V=IRThe Attempt at a Solution By using KVL : V= 3I_{5} = I_{2} = 2I_{4} I = I_{1} + I_{2} I_{3} = I_{2} + I_{4} I_{1} = I_{5} + I_{4} I = I_{3} + I_{5}Now the final result could be obtained by the...

After (partially) completing my goal of understanding capacitors, I'm onto inductors, even after reading the wiki article and doing a little more research, they make no sense to me. Currently what I'm thinking is that they are the "opposite" of capacitors, allowing DC to pass through but...

Homework Statement Of all cylinders inscribed in sphere of radius R largest area of side(M) has cylinder which hight is R\sqrt{2}. Prove. The Attempt at a Solution I understand how to prove this i only have problem with derivative: M=2*r*Pi*H and r=\frac{\sqrt{(2R)^2 - H^2}}{2}...

In physics, I know what is a total average. But the question is what is a Major average?? Does it include Physics courses only? Or with some Maths courses? Thanks in advance

Hi there, Is there an application available on the web, or an .exe for Windows, that enables me to run an experiment involving a Mach-Zehnder interferometer -and will display the relevant result - allowing me also to add wave plates and rotate them appropriately, and define the inputs (i.e...

if magnetic field induce current then why satelites or spaceship doesn't gets electrified due to Earth magnetism

Air is being pumped into a spherical balloon at a rate of 5 cm3/min. Determine the rate at which the radius of the balloon is increasing when the diameter of the balloon is 20 cm. So, to solve, I know HOW to do it, I just don't know WHY it's right. \frac{dv}{dr}=4pi r^{2}...

Homework Statement The temperature ##T## in a region of Cartesian ##(x,y,z)-## space is given by $$T(x,y,z) = (4 + 3x^2 + 2y^2 + z^2)^{10},$$ and a fly is intially at the point ##(-5,6,7)##. Find a vector parametric representation for the curve which the fly should move in order to ensure...

I am considering applying for a tenure-track faculty appointment at the assistant professor level. The call for applications requests contact information for five references. In the past eight or so years, I have had two bosses (my PhD advisor and postdoc mentor) who will surely provide...

I have an application where I am using a 24V DC motor to drive a ball screw. If someone isn't paying attention and they hit the mechanical stop on the ball screw, the current is going to spike to about 200 Amps. The normal running current is about 35 amps, and the max current is 60 amps...

Can someone give me examples of the following two situations and clarify each situation? -An object is stationary but the point of application of the force moves on the object. -An object moves in such a way that the point of application of the force remains fixed. Moreover, what can one say...

Homework Statement Let f and g be two continuous functions on [a,b] and differentiable on ]a,b[ such that for every x in ]a,b[ : f'(x)<g'(x) Homework Equations Show that f(b)-f(a)<g(b)-g(a) The Attempt at a Solution So I said that there exists a c in ]a,b[ such that f'(c)=(f(b)-f(a))/(b-a)...

I know the approach is to use conservation of angular momentum. I also know that I am entirely free to pick which point I would like to calculate my L about. (Although calculating L about the CM will make it much easier, but I'd like to try otherwise) So, if I were to calculate my L(after...

Homework Statement Hello everyone :smile: I have got a cylindrical 6 axis force sensor (so I have the force Fx, Fy,Fz and torque Tx, Ty, Tz). Using these data I don’t know how I can find the point of force application. Homework Equations The Attempt at a Solution I try this...

Homework Statement 1) Prove that if f is an even function and is differentiable on R then the equation f'(x)=0 has at least a solution in R. 2) Conclude that if f is an even and differentiable function on R and f' is continuous at 0 than f'(0)=0. The Attempt at a Solution 1)We...

I am currently in the midst of job hunting as I am nearing the end of my tenure as a postdoc. I have recently come across an external job posting which greatly interests me, and have applied for the position through the online application process. During which, I was disappointed that there was...

Homework Statement A circle C is cut on the surface of the hemisphere x^2 + y^2 + z^2 = 1, z ≥ 0 by the cylinder x^2 + y^2 = y . Evaluate \int_{C} -y^2\,dx + y^2\,dy + z^2\,dz, where the direction round C is such that the point (0,0,1) is directed into the first octant. The Attempt at a...

I need to write a statement of objectives for a grad school application. Here are the instructions online: So where to start: Does this mean: write a sensibly structured statement in coherent English? What is that even supposed to mean? I'm applying to a very broad program...

Dear all, As we know, there are two kind of capacitor polar and non polar. From that, I still did not know yet about specific application of them. Can give me something a clear of explanation of that? thank you reza_diharja

Does anyone have some recommendations for MOSFET's that can be used for high frequency low current applications? The ones I found are for high current applications but my application only requires at max 20mA. Thank You.

Hi, So, there are three towns: A, B and X Town A is 240 km East and 70 km North of O. Town B is 480 km East and 250 km North of O. Town X is 339 km East and 238 km North of O. At A, the airplane changes direction so it now flies towards B. Point Y in the path AB is the closest the...

I attend university in Hong Kong, where (prior to this year's change to a 4-year program) a typical bachelor degree consists of 3 years of study. I am currently in my 3rd year. However, I am strongly considering deferring my graduation and extending my university studies another year, ie...

What is the Application of xerography ? I mean on what principals does the photostat machine works...