Behavior Definition and 317 Threads

An opamp circuit was given in the homework forum: There the circuit was analyzed with the usual assumptions of opamp ideality. But, if the circuit is analyzed with one change to ideality, namely the opamp voltage gain is set to 7 rather than ∞ (this brings with it the change that v+ ≠ v- any...

I was reading a paper the other day that made the following claim, and provided no reference for the assertion. I would like to find a reference or figure out how to derive the asymptotic behavior myself. The situation is as follows: Suppose we have a function ##f(z)##, defined as a power...

Hello, I have a few newb questions. How can I graph the behavior of a double pendulum in Mathematica to make strange attractors like in the Lorenz equations?

Hi guys, Let us consider this thought experiment of having say Avogadro number of bosons in a box. According to statistical mechanics, it is equally probable to find every distribution of bosons in the box. But, say we wait really long enough to find that at one point of time, we find all the...

Homework Statement I was doing a condensed matter problem (3rd year) of a phonon dispersion relation for a monatomic linear chain. It asked told me to derive an expression for the density state per unit length and I obtained the following: g(\omega) = \frac{L}{a\p} \frac{1}{4C/M -...

Hello, simple question here! When a voltage is regulated down or up in a circuit by, let's say a DC/DC converter, does the corresponding current increase or decrease respectively so that the system remains consistent with the laws of conservation of energy? In other words, I want to know...

i know this question should be very simple, but i just dun know how to do what is asymptotic behavior means? x-> infinite ? and does this question need to use binomial expansion? or mayb binomial approximation? i got the ans is 0 but i think my step are not correct any tips ? i want to work...

How can I show that a first-degree Besselfunction a la Jn=Bessel(n,eta) for large etas always lead to something like a bathtub? I.e. how can I show that J(n=eta) produces sth like a overshoot? I would really appreciate every idea.

1.) If the particle they believe to be the Higgs particle has a mass of 125 GeV, then how is it that the Higgs field itself does not have mass or react with gravity? If it is in fact the field creating the mechanism that gives everything its mass, and its particle form also has mass, why is it...

Consider a three-tank system modeled by the equations: x_1' = -5x_1+5x_3 x_2' = 5x_1-2x_2 x_3' = 2x_2-5x_3 (A) Initially there are 10 pounds of grain in each tank. What will the amounts be as t \rightarrow \infty? (B) Solve the system and verify your conclusion from (A). I'm...

λ = h/(mv) so, if the velocity is negative, how could the wavelength be negative??

I recently learned that ohms law is not always obeyed. I found this surprising because I thought ohms were defined in terms of volt and amperes by the equation R=V/I. I did a little googling and found the following definition... This clarified things a little in that the definition of an ohm...

i've read a theory about dark stars resently and I've got some questions that's been gnawing at my mind, hope i can get some answers here. 1: what is the size of an atom? as in if the nucleus was the sun, where would the electrons be? i know diffrent substances has diffrent atom sizes but for...

hi all How would nitrogen behave at 3000psi? or 6000psi? assuming it starts at liquid form and at 1 atms pressure heated to 20 Celsius. thank you

Hi, I've been reading a QM book and it mentions that particles can be represented as a wave packet, which provides a description for particles simultaneously as a wave and particle. It also mentions that the wave packets disperse, and the width becomes extremely large for free microscopic...

Homework Statement y' = -2 + t - y Draw a slope field and determine behavior as t -> infinity Homework Equations The Attempt at a Solution This is the first DE in my book that includes t in the differential equation. The slope field looks pretty wacky. For the others I was...

Hello everyone, I am trying to solve time-dependent Liouville-von-Neumann equations for the dynamics of an electron traveling between several coherently coupled states with constant dephasing time. I was very surprised receiving negative values for diagonal elements of the density matrix in...

Hi, I would like to know how to treat a vector valued function when I want to know where are minima, maxima and saddle points. Thanks in advance!

Like to know the behavior of MR Fluids when rotated inside a hollow shaft subjected to magnetic fields.. Could anyone please help

This is in reference to the Chapter 10. of P. R. Halmos's Naive Set Thoery, namely 'Inverses and Composites'. He speaks of two equations in that section. 1. Let f be a function from X to Y. The inverse of a set is defined as another set as follows. f^{-1}(B) = {x\inX:f(x)\inB}. The first...

Imagine a wire with uniform circular cross-sectional area and length l. It is being pulled at both ends with a horizontal force that is equal and opposite to each other. The wire obeys Hooke's law up to breaking. (1) How do we calculate the work done by the wire if both sides of the wire...

So how exactly do tau plaques resulting from CTE cause strange behavior? Jr. Seau was found dead due to suicide, several hockey enforcers have died violently or due to drug overdoses just recently, and Chris Benoit murdered himself and his whole family. What is the understood physiology behind...

This is more a conceptual question, but after watching several videos about Quantum Mechanics, I noticed a little discrepancy about an explanation of the double slit experiment and it's implications. According to one video, the electron fired traveled through both slits at the "same time as...

Hello, I've made a script to solve a non-linear ordinary differential equation for the temperature (lumped-mass) of a brake rotor due to some constant deceleration of a race car (Qbrake in script). The problem I'm having is properly simulating the velocity of the car. What I'd like for it to...

If a laser was shined at a device to measure the amount of photons striking it and then another laser was shined perpendicular to first laser, would the reading on the meter change?

Homework Statement Air is mostly composed of diatomic nitrogen, N2. Assume that we can model the gas as an oscillator with an effective spring constant of 2.3 x 103 N/m and and effective oscillating mass of half the atomic mass. For what temperatures should vibration contribute to the heat...

I've been reading about what happens to water when exposed to vacuum, but can't seem to find a definitive answer concerning a few details in the step-by-step process. I read that water will quickly boil in the vacuum of space due to very low pressure, and then freeze. But roughly how long does...

It is a GREENLEE "GT-11 Voltage Detector" "50-1000V AC CAT IV" It has a little plastic encased metal nib on the end and it looks like a fat marker. You just stick it in an outlet and it lights up and beeps to indicate a current. There is no read-out, it just detects. Anyway, an outlet of...

Hi! Can anyone recommend a text that goes through calculation in fall time, rise time, saturation time and final rise time thoroughly with some examples provided? I've looked through microelectronic circuit design by Jaeger / Neamen, they briefly mention the concept at best but do not have...

I like to know if electromagnetic waves pass through a medium (Glass) and if this medium were in contact with two other mediums in its boundary which the first one with same optical dense (Glass) and the second with less optical dense (air). Is there any tendency or priority for wave to pass...

Are both sensible (equivalent? contradictory?) interpretations of "Poisson" behavior? I've come across two quite distinct notions (or so it seems to me, anyway) of Poisson behavior and I'm not sure if they're equally sensible or perhaps even equivalent. I'll apply both "views" to the same case...

Hi, I am a novice to nuclear physics and I was reading some stuff about quarks and how they can possesses fractional charge. I was wondering how this fractional charge behaves in an electric field. Does it just experience 1/3 of the force that an electron or a proton would feel in the...

Homework Statement Hello and thank you for reading my question. I am attempting to calculate what effect on a wall has an impact (a car impact or as in my theoretical calculations a punch) of an object into it. With effect I mean how strong impacts can a wall a, survive and b, stay...

Hi, I have been looking for fractal behavior in a data set. I've used the box method to determine fractal dimension by looking at the inverse of box size and the number of boxes needed to enclose the object. These two variables seem to be fairly accurately predicted by a power law...

Homework Statement The equation is f(x) = (x) / (x^2 - 1)Homework Equations The equation is f(x) = (x) / (x^2 - 1) The Attempt at a Solution Well I first took the derivative, which was f'(x) = -(x^2 - 1) / (x^2 -1) ^2 I set it equal to zero to find the relative extremas, and I got -X^2 -1 =...

A girl has been flirting with me to the point that I think it might be time for a confrontation. Since I've never been one to pickup on the subtleties of flirting (much to the dismay of my wife :redface:), I decided to tell her about some of the things this girl does that I'm assuming aren't...

Hello all, I have a few questions regarding the magnetic charge of an electron. First of all, I read an electron behaves like a bar magnet, which would suggest the south-pole of one electron would attract the north-pole of another electron. However, electrons also repulse each other. So what...

There is a variable Vin which goes through a resistor to a node (Vo) which then branches through a diode to a 3V source or to ground through a Zener diode. I'm to sketch the graph of Vo as a function of Vin. -4V < Vin < 4V The resistor is 1K The diode is CVD model, Von is .7V, Vzener = 2.7V...

http://pages.towson.edu/ladon/gases.html "Elastic" means that the energy of the particle before collision equals to the energy of the particle after collision. How is this related to the presence or absence of intermolecular forces and How is this related to kinetic energy? Does the...

Homework Statement I've implemented RSA and just need to print some stats and write to files.Homework Equations My solution works fine when I provide an input file, however, if I let it read from standard input there is no output written to either of my output files. Reading works regardless. I...

From the viewpoint of the continuity principle, we know that the stream of water is fatter near the mouth of the faucet and skinner lower down. The question is how single molecules understand when/how they should deviate from their perpendicular free fall to a deviated one ?

Homework Statement consider a system with a damping force undergoing forced oscillations at an angular frequency ω a) what is the instantaneous kinetic energy of the system? b) what is the instantaneous potential energy of the system? c) what is the ratio of the average kinetic energy to the...

Homework Statement Resonances occur in many physical systems, and are often observed by measuring the frequency response of the system to an applied driving force. use the example of a damped harmonic oscillator to show how the lorentzian function serves as a good description of resonant...

I am almost done in my research on golf balls, however I found something unusual which I can't seem to find an explanation for. After collecting data on a golf swing (golf ball speed, club head speed, backspin, distance etc.) I created a few graphs. Once of them was a force vs distance graph...

Hi all! A professional race-car driver is asked to make 2 different "quarter-circle" turns on a racing track. He completes them at the highest possible constant linear speed (he is well familiar with the car and the road so it's an easy task for him). Turn 1: Radius is R1=20m. Linear...

Homework Statement We are required to sketch a (reasonably accurate) picture of a rational function f(x) = P(x)/Q(x) with P, Q polynomials in x and Q nonzero. We know that the roots of Q(x) are, say, x1, x2, etc. and so f(x) is (typically) asymptotic to the vertical lines x = xk for each k...

For a simple network of resistive circuit, we can compute the values of current and voltages right? However, I'm more curious about how each individual component behave. Is it possible to somehow isolate each resistor and compute their values individually (e.g. not having to compute the entire...

Which of the following is consistent with experiment/observation. When light is reflected off of a material, what happens to the photon? A. Is it absorbed by the electron or lattice and then re-emitted? OR B. Does it somehow just reflect/bounce off the electron/lattice? Kind of...

Okay, I will preface this by saying that I have no formal education in physics. I am just a regular man with an active mind and healthy dose of curiosity. There may be some errors in my terminology, but hopefully you'll get what I am saying. Heck, maybe this is already a well known hypothesis...

The cytoskeletal structures were considered responsible for the elementary cellular intelligence in the past. (For example, see the articles from Albrecht Buehler. http://www.basic.northwestern.edu/g-buehler/FRAME.HTM.) Microtubules are pipe-like structures made of two kinds of proteins...