Approach Definition and 545 Threads

Homework Statement I must solve for the voltage across the resistor labelled R1 in the circuit above. The values given are the resistance of each resistor, the voltage of each voltage source and the current of the current source. Note: If referring to circuit loops consider them as being...

Hi, Using conservation of energy $$m\cdot\ g\cdot\left(h_0-h\right)=\frac{1}{2}m\cdot\ v^2$$ it's easy to find the exact velocity of a pendulum $$v\left(h\right)=\sqrt{2g\cdot\left(h_0-h\right)}$$ at height ##h## above the minimum when it was let go from the inital height ##h_0##. Is it...

I know modern physics theories make use of really high number of spatial dimensions, I wonder how relevant these high dimensions are for physics. I am only a guy from High school interested in physics, but I would like if possible a formal answer

Many important techniques in fields such as CT and MR imaging in medicine, nondestructive testing and scientific visualization are based on trying to recover a matrix from its projections. A small version of the problem is given the sums of the rows and columns of a 2 x 2 matrix, determine the...

Homework Statement A proton of mass m, charge +e and (asymptotic) momentum mv is incident on a Nucleus of charge +Ze at an impact parameter b. Consider only coulomb repulsion and classical mechanics, what is distance of closest approach - d? Homework Equations Haven't encountered impact...

I'm going to (very likely) be doing an honours thesis next fall. There is one professor at my university I've taken a course under before who is awesome and their work is really intriguing. I would love to have them as my supervisor and intend to approach them with regards to it (i.e. asking...

if $\lim_{{n}\to{\infty}} {y}_{m+1}={x}^{*}$, Can we say that $\lim_{{n}\to{\infty}} {y}_{n-1}={x}^{*}$...Please pay attention, I say m and n...

Homework Statement Find all points at which the direction of fastest change of the function f(x,y) = x^2 + y^2 -2x - 2y is in the direction of <1,1>. Homework Equations <\nabla f = \frac{\delta f}{\delta x} , \frac{\delta f}{\delta y} , \frac{\delta f}{\delta z}> The Attempt at a Solution...

I am doing an experiment that generates data in three 1-hour-blocks. Each block has a different number and timing for acquisitions. (The first hour is more frequent and numerous, while the last hour is only 6 acquisitions) The reason for breaking it up into 3 hours is to give the subjects a...

Homework Statement Hi, I am currently in a C programming course and i have no background knowledge of programming whatsoever. The professor in my course isn't very good at explaining so I'm a bit lost here. (Please keep in mind, I am NOT asking anyone to do this for me. I would like to know a...

Homework Statement ∫ ex * sin(t-x) dx [/B] Homework Equations ∫udv = uv - ∫vdu The Attempt at a Solution So I know the easiest way to do this is to just use IBP, and when you start with your original equation you can just use some Algebra to get the answer. But I was curious why this approach...

I have been doing research on entropy encoding for some time.. I found some interesting relationships between Arithmetic coding and other methods such as Huffman Coding. I made an article to explain them and am presenting here for review: http://siara.cc/arithmetic_coding_new_approach/ I have...

this starts as a calculus question, but springs into where i can get help with david bachman's A GEOMETRIC APPROACH TO DIFFERENTIAL FORMS second edition. looking at paul's notes cheat sheets http://tutorial.math.lamar.edu/cheat_table.aspx we have## \int \frac{1}{\sqrt{a^{2}-x^{2}}} =...

Hello. I'm wondering why my approach to solving this problem (Morin 3.2) is faulty. Homework Statement A double Atwood's machine is shown, with masses ##m_1##, ##m_2##, and ##m_3##. Find the accelerations of the masses. Homework Equations ##F = ma## The Attempt at a Solution Let's say the...

By calculating the distance of closest approach, an estimate of the size of nucleus can be made. I believe it can give only order sequence of sizes of nuclei of different elements and obviously not exact size as electrostatic repulsion is balanced by KE of the incoming alpha particles away from...

You see in my country there are only few BE Mechatronics which only top notch students can get MY question is that should I do my bachelor's in Mech or Elec Engineering for later doing Master's in mechatronics and yet having my options open for Energy Engineering, Aerospace Engineering and...

http://arxiv.org/abs/1409.4918 Abstract: We examine the cosmological consequences of an alternative to the standard expression for bulk viscosity, one which was proposed to avoid the propagation of superluminal signals without the necessity of extending the space of variables of the theory. The...

Homework Statement : 1) Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given K = 9 x 109 constant, Z = 2 and (hfPlanck's Constant) = 6.6 x 10-34 J s] A) 2.92xl06m/s B) 1.46xl06m/s C) 0.73xl06m/s D) 3.0xl06m/s[/B]Homework...

Greetings. I completed my bachelor's in physics from the 'University of Delhi', India, an year ago and I wish to pursue a career in fundamental research. I knew that a Master's in Physics was a very serious business and thus took an year off making sure i was ready for it. However i have been...

Hi I'm reading Elementary calculus - an infinitesimal approach and just wan't to make sure my understanding of what dy, f'(x) and dx means is correct. I do understand the basic idea: You make the secant between 2 points on a graph approach one of the points and at this point you get the...

Hey, My name is Jason, I am currently allmost through Electro technology course, and have studied DC, Magnetism and currently studying Alternating Current Circuits The maths i have been learning while studying this course would be some Algebra, Trigonometry, Pythagoras Theorem, vectors etc. I...

Question: I have a function of time. Its expression has a constant 'b' in it. I am asked to ascertain how changing 'b' affects the function. Specifically, I have velocity as a function of time which accounts for drag forces; 'b' is the drag coefficient. I am asked to ascertain how changing 'b'...

I saw a problem the other day that belongs to a class of problems that I have forgotten how to solve (I'm 55). It went like this.. Trains leave a station every 15mins and every 20 mins. The first two leave together at 9.10am. Do any others leave at the same time and when is the next time? The...

In general, when dealing with mechanics problems using a function ##f(q1,q2,...)=0## that represent constraints one is minimizing the action ##S## while adding a term to the Lagrangian of the not-independent coordinates ##L + \lambda f ##. One can show that this addition doesn't change the...

So I am starting to learn for the final exam a bit early and I am trying to do this problem with a uniform beam which is reinforced with iron inside. I know how to calculate this if it wasn't for the reinforcement within the concrete. I know that the purpose of the iron reinforcement is to...

I try to figure it out but I can't get the answer that I need and when I look upon the solution from the book I don't understand it at all. The answer is " no limit" and there is no explanation why. The question is Determine the limit of lim (x2+y2)- -> infinity (xye-(x+y)2 in this case I use...

I've heard that some professors choose to teach introductory physics by introducing energy and conservation of energy before anything else. This seems pedagogically convoluted to me. Could someone point me to a source that does this so I can get a better understanding of how it's done?

$y''+\frac{1}{x}y'=\frac{2}{x^2}-4$ Hey. This is probably really simple but I'm stuck :p how do I approach this?

Would it be possible to have a generalised equation for magnetic force of interaction between magnet-magnet and magnet-ferromagnetic materials maybe iron.

I've decided to work on some topics about supersymmetry for my undergraduate thesis. My background is that I have had a one-semester course in differentiable manifolds, plus typical undergrad math courses, real analysis and module theory (graduate algebra). So, I went to the library and found a...

Homework Statement I am currently embarking on a project which requires me to design a system where I can transmit voice over a distance, by inputting an analog voice signal on one end and then recovering the voice which I input on the transmitting end at the receiving end. The general design...

Hi! I'm interested in mathematical analysis of Full-Wave Bridge rectifier with smoothing capacitor. I tried to find it on web but without success. I read how smoothing capacitor affect output voltage, but I never saw some mathematical description. Can one mathematically prove it? How can one...

When people attempt to build one, they usually put objects near its focal point in front of the mirror but i wonder, has anybody tried "collecting" the light and aligning the beams in some way to be used as one? I know that the light is coming under different angles but is it possible to align...

Do you have any smart ways or know any law articles or clauses that can protect employees 'rights who sign at-will contracts with their employers ?

Hi guys, I was wondering if anyone knows of a good source/paper that I can find online that details how to derive the MSW Hamiltonian from a field-theoretic approach, or from an effective field theory approach or anything like that? Every time I study the MSW effect, the Hamiltonian...

According to Carnot theorem, the higher temperature of a hot side and the lower temperature of a cold side the higher is the efficiency of a heat engine. Does it mean that in theory it could get anywhere close to 100%? If we take in account that 100% efficiency means it is a perpetuum mobile...

Hello all, I have a strong interest in nuclear science, especially medical physics, and I'll soon be transferring from a community college to a university that has, I believe, a very strong nuclear engineering department. Will undergraduate study in nuclear engineering or physics provide a more...

Homework Statement Answer the following questions about the given circuit. These questions will walk you through the steps of the analysis process we call nodal analysis, which is applicable to all electric circuits. 2.1 (3 pts) A quick Fermi-type problem before we start. Use Ohm’s Law to...

Okay, first of all, I'm not very good at maths, so I will have to talk in programmer terms here. I have the following issue: A small rocket is moving in space, and I want it to move to and stay at a location in space, similar to a quadcopter. No as far as I see it, I have the following variables...

Hi all, I have a question which bugs me forever. Anyone happens to know about pseudoparticle approach? In many-particle physics, suppose we have a many particle hamiltonian which has eigenstates in Fock space, i.e., with 0, 1, 2, 3, ... electrons, denoted by \{|S\rangle\}, here S represents...

Homework Statement A proton and an alpha particle (q= +2e, m=4u) are fired directly at one another from far way, each with an initial velocity of 0.01c. What is their distance of closest approach, as measured between their centres? Homework Equations mivi = mf vf and KEi +Ui = KEf + Uf U =...

Hello, I am looking for a website that contains information such as the interval between Earth and uranus' closest approach. I can't seem to find exactly what I am looking for, so I was wondering how difficult it would be to calculate this. I am at a loss where to start though... Any pointers...

Homework Statement 2. The attempt at a solution I would use the arctan (Position j / Position i) and set it equal to the position vector. Then I would substitute values from the graph to find the variables. The solution manual, however, takes the derivative of the position vector and then...

Hi there! I have a problem about the proof of an equation in microscopy. I think this is the right section because it is about solving the Helmholtz equation. I'm looking to Wikipedia page http://en.wikipedia.org/wiki/Multislice where they try to solve the Schrödinger equation for an electron...

I' m trying to solve something as apparently simple like this cos ax/sin pi*x which appears solved in https://archive.org/details/TheoryOfTheFunctionsOfAComplexVariable in the page 157, exercise 9. second part. I'm trying by Fourier series, but by the moment I can't achieve it. Thanks.

Hi All, Recently we've been working on the distinction between the Eulerian and Lagrangian approaches in Fluid mechanics. I understand the simpler examples like a running stream of hot water etc. However one example is really tripping me up. So what's confusing me is that in analyzing...

Hi if i have a function that relates time and distance travelled, is this correctly understood: (please tell me what is correct and what is wrong - it would help me understand) The function is f(t)=16(t^2) 1. f(4) = 256 This tells me that at the END of 4 seconds (or is it at the...

Homework Statement I am calculating matching impedances for a source and its load using 2 different L-network topologies. One is: source-parallel-to-C, load-series-to-L and the other is: source-parallel-to-L, load-series-to-C. I go through all the calculations and notice that...

If a student acquired private funding and would like to work with their University on a project how would they go about approaching them? A little background, I am an undergraduate engineering student with 20+ years experience in the business world in HVAC, construction, journalism and...

Good day! I am a beginner in Finite Element Analysis and Structural Mechanics. I have problem in understanding the insight of potential energy approach to derive spring element equations. I have already search for similar post and I found this, and agree with the example raise...