Mode Definition and 295 Threads

Homework Statement A string that is fixed at both ends is vibrating in the third harmonic. the wave has a speed of 186m/s and a frequency of 225Hz. the amplitude of the string at an antinode is 0.0037m. How much time does it take the string to go from its largest upward displacement to...

Is it possible to exactly derive the mode of a probability distribution if you have the characteristic function? I cannot get the pdf of the distribution because the inverse Fourier transform of the characteristic function cannot be found analytically. Any thoughts would be appreciated...

I understand Common-mode rejection ratio. I do not however understand common-to-common Mode rejection or common to differential mode rejection or differential to common mode rejection. I am looking at this in regard to twisted differential pair cabling, specifically jacks. I can find the term...

hi,im a newbie over here,my physics quite poor so i really need help by understanding it,i jz wanted to ask could any1 please explain to me what is in phase,&out of phase?;im totally baffled.:blushingAnd what's frequencies of the normal mode in standing waves in a string fixed in both ends?i...

I am so confusing why the fundamental mode of one-open-end string must satisfy that one-fourth wavelength equals to the length of the string. I read four textbooks but none of them tell why it is. And one textbook said we must make sure dy/dx=0 at the open-end, but I don't understand why.

Here is a nice demonstration of resonance and vibrational modes.

Hi all, set up: USB devices in power mode have three types a. high power mode ( 500mA) b. Low power mode ( 200mA) c. Self powered mode. in one of our applications we are configuring the device as low power device at the descriptor level ( Software). Once the host has the device...

Hello. I have a Magnavox TS2560 B101 television that is stuck in demo mode. My parents have thrown away the manual along with the remote, and none of the keys on the TV will work. The demo mode simply shows all the TV's features, and plays continuously. The only way to turn the television off is...

Question is what is the mode when all data are unique? have a set wherein the actual question is what is the inference about the PDF for the data? Median > mean but no mode...i was under the impression that PDF is only for a continuous measurements...when data set is unique...in which case it...

This news was saying that IE will get privacy tools in 2008 http://news.bbc.co.uk/2/hi/technology/7574265.stm There's another browser (mentioned in the above article) http://xerobank.com/personal_intro.php that allows secure surfing at 1$/month? I was wondering doesn't Firefox have it all...

What is the difference between eigenfriquency and normal mode? If, for example, I solve the secular equation (from the equations of motion) for a mechanical system (say two masses on springs) to obtain the eigenvalues I thought I got the normal modes, but now I am told I get the...

If there are TE mode and TM mode in an optical waveguide, how to detect them? Thank you!

I'm working on a laser interferometry system that uses a pair of balanced photodetectors to record the signal. Each detector is on a separate port of a beamsplitter cube, and as a result receives (in theory) the SAME signal. The rationale for using the balanced detectors is that "they reject...

Here is the problem: The PMOS transistor in the figure is conducting current. (a) Is V_TP > 0 or V_TP < 0 for this transistor? (b) Based on the value of V_TP, what type of transistor is in the circuit? (c) Is the proper symbol used in this circuit for this transistor? (d) If the symbol...

I am running MATLAB on Leopard, i need to run a dos program via MATLAB script file. I also have windows xp running with parallel desktop. my m file is in the same directory as the dos program, on my virtual xp drive. i have tried using commands such as system and dos.. but to no avail...

Hi, (All oscillations I'll be talking about here are longitudinal.) For coupled oscillations of 2 masses between 3 identical springs (ends held fixed by walls), I think it was a standard textbook mechanics problem to show that the lowest-frequency mode is the symmetric one (where the masses...

Alright. I'm having a little trouble getting started on this design of an interferometer. Essentially what I want is to couple a laser into the single mode fiber (SMF), which is fusion spliced to a multi-mode fiber (MMF). Assuming the fiber is unperturbed, the modes will not mix and you will no...

Hi all. I am taking a course in mechanical vibrations. I know that a mode shape is a pattern specific to a natural frequency of a system. That maens, the mode shape is determined under the context of free vibration, right? What kind of information can we obtained from the mode shape? Is the...

I have a few questions concerning opamps. First what is the big deal about infinite common mode rejection? It seems to me by looking at the open-loop gain equation A(V2 – V1) = V0 it is obvious that when V2 = V1 the output is zero (common mode rejection). This may be where I am confused …...

Can someone explain to me what it means by nonlinear mode? I heard people saying that soliton is a nonlinear mode of the nonlinear schrondinger equation and therefore perturbed pulses tend to reshape to the soliton shape. In the reshaping proces, the energy dispersed is known as continuous...

Dear friends, I need some help regarding running Gaussian 03. I have a complex molecule (64 atoms with 6 types of atom)...and finished geometry optimization successfully using method b3lyp with basis set pVDZ.. it took 4 days to complete this optimization procedure...Now i want to do frequency...

Hi Member, does anyone have some experience with normal mode analysis?I need to know from basics...i want to use this analysis for finding the vibrations of a complex molecule...(may be by using Urey- force constants,etc..or if u know any other method !). eagerly waiting Rajini

I have to find the maximun bps that it can be reach using a point-to-point link of 40 km long of optic fiber. I use an ITU normalized channel (100 GHz optic BW). So, I can choose any electric modulation and any optic modulation, too. Anybody could help me? Any answer is welcome. Thanks.

Homework Statement Two equal masses are connected by two massless springs of constant k and nat. length l. The masses are constrained by a frictionless tube on a pivot, (also massless) so that they remain colinear with the pivot. The pivot subtends angle theta with the vertical. The 1st mass...

I've recently bought a Hp 50g calculator and it offers the RPN mode which the Ti's don't have. I've been using algebraic mode up until now and I heard that RPN still beats it in the long run. I know that you can save many key strokes with RPN but it will definitely take me some time to learn the...

I've read an article in nature and found technical words "B mode signal" and "E mode signal". I don't understand what they are. In a website, they say it's like the electromagnetic field line but I'm still not clear. I also don't understand what k means in " the linear greyscale shows the...

In the problem, A string's tension is adjusted so that the speed of sound waves on the string equals the speed of sound in the air. The fundamental mode of oscillation is set up on the string, and in a pipe with one end open and one end closed with a length of half of the string resonance is...

Is there really such a thing called "starvation mode?" In other words, does a person's metabolism lower if he starves himself? I have heard reports that a persons metabolism actually rises for s short while, then lowers. Also, can't coffee and exercise raise your metabolism? For example: If a...

Hi, does anyone know what are the 4 different cases in a common mode differential amplifier? thanks a lot for all of your help. thanks, peace

Hi there, I'd like to switch 220-250v AC (50/60Hz) to 5 or 3.3v DC as easily and in the physically smallest way possible. Can someone offer advice on this? Do there exist IC's that will just do this for me? I have experience with LSR's but a transformer is too bulky for my needs. Thanks!

http://www.space.com/news/060623_hubble_acs.html

hey guys, the topic basically explains it...Can someone please help me out with this question...How does SMPS differ from diode rectification? Thanks jake

what is the mode (modus) of 1,1,2,2 I was checking the definition but it didn't count with two maximums. So is it 1,5 or both 1 and 2, or none of them?

Hi. Suppose that I want to look at the BDH action for a bosonic string: S_{BDH} = -\frac{T}{2}\int d^2\sigma \sqrt{\gamma}\gamma^{ij}\partial_iX^a\partial_jX^b The string is in flat spacetime and \gamma_{ij} is an independent world-sheet metric. I know that going to conformal gauge allows...

The group velocity is always negative except k=0 and k=Pi/a in the optical mode, is there a reason from the general picture of crystal vibration? Well, it seems to me that optical mode describes the situation that different atoms in a unit cell have opposite motions. Also, in the optical...

Will the median and mode change if the mean and strandard deviation change?

Hi, I'm new. I read aboot how an electron, and a positron colliding is supposed to produce two separate gamma rays in completely opposite directions 180 deg away from each other. I understand that the gamma rays are supposed to correspond perfectly to the mass of the particles involved. I am...

Need help... secx=3.45 (0<=x<=2pi) (Accurate to 2 decimal places) secx=-5.2 (0<=x<=2pi) (Accurate to 2 decimal places) How do you do these questions?...i am getting mixed up by doing it on the calculator...use radian or degrees mode??...cos or cos-1?...and also about csc and cot too...can...

urgent question: localised mode, localisation effect of linear atomic chain Hello everyone, it is great place you have here, hope I can learn a lot from you I am doing some readings and there are couple of concepts that I haven't been familiar with and if you spend a little time to help me...

When i am booting Knoppix 2.78 from a CD,It gives the error :Invalid screen mode 0 ff77 80x60 1 ff45 80x45 etc Enter correct mode number or scan When I enter 0(or ff77) or any other value,it continues upto showing the wallpaper and then crashes. Thanks in advance

I need information on coupled mode theory, specifically with reference to cylindrical waveguides. The more info the better. I have some references, but they are quite scattered, I am yet to find a reference that really encapsulates the 'heart' of coupled mode theory. If anyone has a good...

Can a so called "common mode voltage" be a dc voltage?? Say there is a simple series circuit... a DC source.. a resistor.. and finally a motor. The point where the motor meets the DC source is the ground. Neither side of the resistor is at ground potential. So if we want to measure the...

what is meant by SINGLE LONGITUDINAL MODE in laser?

Hi, I was wondering how you would re-arrange the differntial mode equation : Vo=(V2-V1)*(Rf/R1) to have V1 as the subject of the formula - its been annoying me for ages. thanks

How a computer is put under a STAND BY mode using Windows98 SE