Behavior Definition and 335 Threads

hi, i tried to simulate a simple capacitor and resistor charging circuit like this i used an imaginary resistor value "10M ohm" the result as you see appear to be strange, why this happened? is capacitor's charge is relative to the voltage on the capacitor it self? and i need some...

Just a general question here. So for a polynomial function, the behavior of the graph at the zeros is determined by the evenness or oddness of the magnitude of the zeros. If the magnitude is odd, the graph will cross the zero. If the magnitude is even, it will bounce at the zero. Why is this...

Some of my colleagues and I captured the i_D vs V_ds/V_sd curves for the CD4007 MOSFET IC (http://www.ti.com/lit/ds/symlink/cd4007ub.pdf). We did this for the NMOS and PMOS transistors. I have attached the curves to this post. The NMOS curve is as expected. However, the PMOS curve seems to be...

I am trying to simulate concrete material under three-point bending in Ansys Workbench 16.0. The concrete beam (unnotched) will be under displacement load at the center while as the both ends will be fixed. The design geometry is simple which I have already completed. I ran the simulation using...

To begin: This is not a question, but an anecdote. The other day my wife called to me from the floor above: "Svein, there is no light". OK, I checked the fuses, and sure enough one fuse had tripped. I resat it, only to hear "Svein, it is blinking!". I went up to see what she meant by that and...

Hello This is the video: Question: why does the ant seem to be trapped by the ink circle? Thank you for your time. Regards, ORF

Very simply put, I have an intense desire to understand an experimental result which, on the surface, violates entropy and the arrow of time-- although, since the experimenters predicted exactly that outcome, a deeper analysis must show that it does not actually violate entropy and the arrow of...

Hello, I am startfing to study kaons and I can not understand why (or how) We know that the decay process of k → 2 π is much faster than the K → 3π. In the Griffits´ book he says that: The reason is the energy released is greater. But I don´t get it. Can someone explain me this issue a bit...

Why is it that the flux linkage does not change instantaneously ? is it some property of magnetic fields?

I was hoping to get some assistance in reproducing a calculation from https://arxiv.org/abs/0803.1292 (https://journals.aps.org/pra/abstract/10.1103/PhysRevA.78.012304 for the published version). A certain four-spin correlation function for Kitaev's spin-1/2 model on the honeycomb lattice is...

Homework Statement This isn't really part of my homework, my homework was to draw a pretty graph, but I am curious about some behavior. I was given a picture of a sinusoidal function. I found it was ##2sin(\frac{\pi}{3}t-\frac{\pi}{6}) + 6##. Then I used trig identities to get...

Homework Statement A gamma-ray burster is an astrophysical object (probably a fireball of hot gas exploding outward from the vicinity of a newborn black hole or colliding neutron stars or colliding neutron star and black hole) at a cosmological distance from Earth (∼ ##10^{10}## light years)...

when antiparticles meet then they destroy each other... It sounds like how waves act when opposite waves pass over one another and you have destructive interference, is there any correlation?

Hello. Can a microorganism change behavior of an animal? ( including humans). Thank you for your time. Regards, ORF

I have these two very large (ferrous core) coils, They are basically identical, each 200mm long and have a diameter of 100mm. The core is medium grade steel One coil is receiving an input of 8V(peak-to-peak) @ 4 MHz from the function generator. The second coil is placed 1m away, and is...

[Mentors' note: Split off from this thread as it was a digression there] After you make a measurement and find the particle to be in a particular eigenstate, if you measure that particle again will you find it to be in that same eigenstate?

Homework Statement I'm a pharmacologist and I have a modern physics course to do. This is not my field and I'm completely lost... We were given this problem to do. Thanks a lot in advance. Consider a potential where U(x) = 0 for x ≤ 0 U(x) = -3E for x > 0 Consider a particle of energy E...

Hey all, Consider a general 2D configuration of a P+N junction where a small P+ material rectangle is placed upon a much larger N-material rectangle. So, the interface between the P+ and the N comprises a flat boundary line terminated on each side by a right-angled corner (hope I'm being clear...

Hello, at the moment, I am working on my project of particle acoustic levitation, but I want to move the particles in a certain direction. In order to generate ultrasound wave for moving a particle, I want to use two transducers. Now, my question is: Has the reflection of those sound waves...

Asked to find first three terms in the local behavior as x→0+of the solutions of y′+xy=1/x^3 This was taken by bender and orszag book Working : I tried to use method of dominance but later realized that we can find using the series expansion. But I am not sure how to proceed. Please advise...

Hello, I'm not very familiar with this problematics. So sorry for (maybe) incomprehensible terminology. I study physics and math and now I heard about chaotic behavior of many very fundamental equations describing a nature, when they evolve (when we want to know what will happen in future). I...

This question is regarding classical black holes. So inside the event horizon, spacetime behaves strangely. Space is now one dimensional and only in the forward direction(that is, into the singularity) and time of events is preceived as forward and backwards since light from a source comes...

Hi, I want to ask about the Wave behavior of light. Fine, I know all about the slit experiments and the resultant interference patterns - but I want to ask about the physical context. So light is the carrier of electromagnetic force, and thus its wave oscillation pattern represents an...

Consider Z(s)=Sum(1/N^s) For n=1 to infinity. Let s=(xi+1/2). The divisor is then: N^(xi+1/2) This is equivalent to (N^xi)(N^(1/2)) As n increases, the n^1/2 term will more greatly slow the increase of the divisor and accelerate z(s) away from zero. This means that zeroes will occur less...

If there are 3 positive charges of +1, +3, +5 coulombs equidistant from a negative charge of 1 coulomb what positive charge will this negative charge be attracted to ? Is the result different if the charges exist in a “bound” state (resulting in electrovalent compounds) where a positive charge...

Ideal gas behavior condition is high temperature and low pressure, right? so is the book's answer to 10(a) ii wrong? https://scontent-kul1-1.xx.fbcdn.net/v/t34.0-12/14996536_1455768127770250_1228715611_n.jpg?oh=750e2555f8229aa9a4eeb17e3e80b1fb&oe=5829A2EE...

Good day guys :cool: I need your help. I am going to run the open field test for social behavior, I need to put two rats in open field arena and then to measure what time they will spend close to each other or far from each other, also to see the distance they cover. Essentially, I need to...

Good day guys :smile: I need to conduct the behavioral tests on rats. I need some free program for social behavior; the program should be able to track two rats simultaneously, their movement trajectories and time spent by these animals when they are close or far to each other (and to analyse...

Hey guys, So I'm interested in the application of an eddy current brake system as a high intensity shock absorber of some sort. The system would consist of permanent magnets concentrated on a stationary, non ferromagnetic metal. If a sudden, intense force were to act upon the non ferromagnetic...

From the hyperphysics site http://hyperphysics.phy-astr.gsu.edu/hbase/elacol2.html#c1 on classical elastic collisions I see that if an incoming particle of mass ##m_1## with velocity ##v_1## collides into a stationary target particle of mass ##m_2## then the velocity of the target particle after...

Hi, everybody! I can not really understand the particular behavior of the sin2thw with respect to the scale (like on the plot below). Clearly there are three regimes from the left to the right: a plato, a degradation and a steep rise. But why exactly does the curve behave like this? The...

Hello there. I am taking a closer look at the small-signal behavior of a common source amplifier with active load (see image) and I wonder which capacitances cause the decrease in gain for high frequencies (beyond 106 Hz). I do not know about the magnitudes of the input and output capacitances...

Hi PF! I'm plotting a line in TikZ using the following code \draw[domain=0:25,samples=100,color=blue,variable=\x,line width=1.5] plot (\x,{0.9924686128641765 - 0.023406305144575135*\x - 0.0006942621866861979*\x^2 - .000001925581045950128*\x^3}); The largest zero is 24.0699 but latex is...

Do space-time have such behavior that if we give force on it and eventually it reacts according to the third law of Newton?

The 2016 Asimov Debate had a part where NGT was discussing whether or not if we could create the computer algorithm to compute all the fields, perturbations... of quantum physics and let it run, would the macro laws that we know fall out of the simulation? He mentioned the gas laws as an...

I believe this question will be a no-brainer for many members. I want to conceptually grasp how do atoms (and molecules) behave using QM in contrast to the classical physics model. Now there's uncertainty principle and atoms don't have a fixed position and momentum, and that's fine, I know it's...

I was wondering if anyone knew what happens to a protein that gets wrongly assembled due to a mutated RNA? Does it just do a slightly different or very destructive action in the organism, or does the organism catch it and kick it out? Also an extra side question: Speaking of mutations of RNA...

So I have a diff eq dy/dx = ky - w where K and W are constant's I want to draw a phase portrait so i set ky - w = 0 and determine the expression equals 0 at y = w/k so I want to study the behavior of the solution greater w/k and less than w/k so I plug (2w/k) and (-2w/k) and check the...

Thing is, I have a male cat which is very wild, sometimes when I'm walking on a room it would came towards me to attact me as a pray, sometimes it hurts me...I told a friend about it and she told me that if I castrate my cat it wouldn't behave that way again. So, as I know that this behavior is...

Homework Statement I have the following matrices 0 1 1 0 0 2 3 0 0 8 7 0 As you can see, the only thing that changes in the matrices are their non-zero entries. How can you relate those matrices by using a simple word or definition?. I need it for a mathematical proof that I am...

I'm trying to determine the point, in 3D space, where an arbitrary line/ray intersects with an infinite plane. Using an article on Wikipedia, I tried to reproduce the presented formulas in code. This seems to work fine so long the ray is emitted from the origin of the coordinate system (0, 0...

Two doubts: First, when the hammer hits any string, the string begins to vibrate, until here, no problems, but, the vibration decays over time and this decay is linear, exponential or assume another form? Second, when the hammer hits a string and the string begins to vibrate, it vibrates in...

Is a triple pendulum with a significantly heavy end-mass supposed to spaz around? Using the Euler-Lagrange formula in Mathematica, I've found (and simulated http://poteat.github.io/triplependulum.html) a triple pendulum system with arbitrary masses and lengths. The rods are massless (so no...

Hello everyone I'm new here:D I'm doing a project on siphons and I'm trying to understand how a practical siphon works. I did a hell of a lot of reading and the explanations havd gotten jumbled up due to so many misconceptions. So anyways I conducted some experiments and a few strange things...

If an ideal inductor is connected directly (no resistor present) to a DC voltage source, why does it behave like a short-circuit at time t=0? If voltage across an inductor is related to the change in current (i.e. di/dt), then shouldn't the voltage across the inductor be very large at time t=0...

Hi! I know some constitutive models for elastic materials like Neo-Hooke or Mooney-Rivlin, which give a relation between elongation ##\lambda=y/y_o## (where ##y## and ##y_o## are the length of the elastic material in a uniaxial compression test in the direction of the compression at stress ##P##...

[Moderator's note: post spun off from previous thread.] I'd really like some verification on the following. After thinking about light redshift, I came to the following conclusion: Is it true that λObs / λEmit for 1 particular star doesn't stay constant over time even if its recession speed...

Homework Statement [/B] I have a string that's infinite on one side, as well as a string that's infinite on both sides. The displacement at the center (x=0) is the same for both, as shown in the pictures. Homework Equations [/B] I think the G term goes to 0 because there's no incoming wave...

So, I foolishly bought a TI-89 Titanium on Ebay that was known to be in a locked up state. I've fixed locked up things before and figured I could here, too. Bad move. A thread here indicated that the hot car trick might fix it. I thought it had, but basically I think that was just due to...

If someone were to ask you to define the difference, what would you said? (to justify modeling a material one way or the other) In an elasto-plastic solid you see permanent deformation after the yield strength is breached as a function of ... stress, right? (in the von Mises regime). If the...