What is Basics: Definition and 378 Discussions

Hi, I am working on my notes dealing with standing waves and I was wondering would a graph of the equaion y(x,t)= 2Acos(ωt)sin(kx) just a regular wave? Also I was wondering why are standing waves called standing waves. I am sorry if this is the wrong forum.

is it true that analog signals are the logarithmic version of the natural signals... and hence the name a-na -log.? what is the meaning of infinite information contained in analog or continuous valued signal? please elaborate

is there anyway someone could explain basically how a vpn works (specifically "HotSpot Shield)? I am asking because i can't figured out if I am getting hacked or if the network is supposed to do this? Whenever I connect to a wireless network, hotspot shield secures the connection and then i...

Hi guys, can you please explain me what happens in the circuit I've attached? It looks easy but still puzzles me. I mean if one voltage supplier was missing i know that the two capacitors are connected in series, and they will charge. Having two voltage suppliers do the capacitors still charge...

I have figured out the answer to the question, but I have no idea why and how it works. I have attached a copy of the question. I do apologize I am still having trouble putting into latex, I can install some but not all, so bare with me. So if I multiple out the matrices I get \chi2 +...

How does you normalize a function? Could someone explain it very basically and give an example.

If you write $$ e^{ik\theta} = \cos k\theta + i\sin k\theta, $$ then $\sum\limits_{k = 0}^ne^{ik\theta} = \frac{1 - e^{i(n + 1)\theta}}{1 - e^{i\theta}}$ yields two real sums $$ \sum\limits_{k = 0}^n\cos k\theta = \text{Re}\left(\frac{1 - e^{i(n + 1)\theta}}{1 - e^{i\theta}}\right) $$ and $$...

Homework Statement OK, so, a compounding of my knowledge so far. - A waveguide is a conduit for EM waves. - They can be parallel plate (infinite), circular, or as I'm looking at - rectangular. - Speed of propogation is limited by skin effect - the higher freq, the thinner the skin & so higher...

What is thrust?? can someone please give me a brief explanation about the thrust force?

Hello experts! Q#1) Write down the family members of {110} plane in a cubic crystal. Attempted Answer) According to my study the this family has 6 members. But what are they? Are these the members (110),(101),(011),(-1-10),(-10-1),(0-1-1)? Q#2) Describe the method to construct the...

Hi All, I am new to a laboratory and they have this EB-PVD machine. I would like to know how several parameters affect the coating as well as the target. The basic concept that I know about EB-PVD is that electrons are accelerated so that it can heat the target and eventually reach a point...

I've been studying ANSYS v11 from a book I bought online. I remember doing the same during my graduation. Now that I am studying in-depth I'd like to know why meshing is required (in more technical terms). Also, I am solving 2D truss related problems where I realize meshing is not done. However...

I've been sitting at my desk trying to prove this and nothing, already tried googling.. Any help guys? I want to know how to derive it from basic principles. Thanks How I came by it: I'm a high school student and was doing my exam then get asked about drift velocity and it's not even in the...

I know it must relate to the velocity profile being a parabola shape and the max velocity being at the peak of the parabola - I wanted to know whether there are actual calculations I can do to show this? I only know the basics so as much details as possible would be great help...

Hello everybody! This is the first post for the differential equations tutorial. Unlike the one on MHF, I've decided to take this project a little more seriously and have taken on the task of making a book based on these posts (well, it's really the other way around - the posts will be the...

The 5-sigma event that denotes the "discovery" of the Higgs refers to a spike around 125 GeV against some polynomial curve fit against the data? and what is events / GeV - what are the other events at the various energy levels?

Can we explain the meaning of the modulus(absolute value) with these equations? |x| > a =>x > a or x < -a(if a \in R+ and x \in R if a \in R- |x|<a => -a < x < a if a \in R+ and no solution if a \in R-\cup{0} If yes, then examples please?(for instances in x and a) Blindly apply these...

\frac{5}{15} \Sigma Is this what people mean by LaTeX. Just wondering. Thankyou.

Right, This is very confusing for myself, I'm pretty sure it will be so for everyone else. My question is really related to quantum theory, but I find it most appropriate to spell it out here as it's more of a maths question on the basics of probability. Here my experiment: I stand at a...

I'm looking for proofs to the 2 following results. Let \displaystyle{e=: \lim_{n\rightarrow +\infty} \left(1+\frac{1}{n}\right)^n} Show that: 1. Universality of e. \sum_{k=0}^{\infty} \frac{1}{k!} = e 2. Derivative of e^x . (e^x)' = e^x, ~ \forall x\in\mathbb{R}...

Hello all, I have a fundamental question regarding batteries/power supplies that I've been wrestling in my hand. Essentially, what I'm stuck on is this- Why can't you create a simple circuit going from the + terminal of a power supply, through a lightbulb, and straight to ground (Earth)...

Hi, All: I bought a liquid mix of teas, which turned out to be way too sweet for my taste. I was hoping to be able to somehow isolate the sweeteners (mostly cane sugar; there is also honey, but the honey is blended-in with the mix) from the rest of the mix, by using basic...

Hi, I'm an undergrad in EE who wants to learn the basics of solving PDEs (and Fourier series/transforms), but who has some learning disabilities (developmental, most notably). Before I get criticism for what I'm about to say (which will be asking for an alternative to the obligatory "read...

Hey all...I've recently been working with some F.E. candidates and I notice they are very weak on the basics of electrical engineering. So I had to force these things down their throat. If you are a college student specifically...you need to know these backwards and forwards! You should be...

Hi guys, I am a newcomer to this. Actually I have confusion about Computer Architecture basics. So, I want to know what CPU actually is ? I mean is it a Microprocessor or Micro controller ? What is the difference between CPU and Processor ? If CPU is a Processor, then why we call it as...

Hey everyone, I could do with a hand checking my understanding of calculating the current loss in cables just to make sure I am doing it right. First up, is power loss. From my understanding of ohms law and P=VI it is possible to calculate the power loss in cables by using the formula power...

Another stupid thing I've come across and thought; what? Mainly down to not having many example questions to look at, I'm sure that'd help a bunch. I am self studying this topic so apologies for what may be silly questions... Looking at the formulae for Gravity, Gravitational Field...

Can anybody tell me the basics of EM waves...like what constitutes EM wave...what is displaced...what are electric and magnetic field components...?

"Fundamentals of Electrical Engineering" Circuit Basics Question Homework Statement I am asked to find p1, p2, p3, p4. Homework Equations p=vi ƩP=0 The Attempt at a Solution p1=(5)(-9) =-45 p2=(2)(9) =18 p4=(3)(5) =15 p3=v(.6i) =v(.6(4)) =v(2.4) I know that v=5 and...

Sorry if I sound naive but why do so many Linear Algebra books have the titles "and applications" only to give maybe one snippet of applications in each chapter.. I feel ripped off by those titles. I have Linear Algebra with Applications by Strang, Linear Algebra And Its Applications by David C...

Alright, I have a kind of dumb question: Why do I distinguish between dq and dqi when considering the propagation from qi to q to qf? For example, if we want the wave function at some qf and tf given qi and ti, we may write: ψ(qf,tf)=∫K(qftf;qiti)ψ(qi,ti)dqi Why do we distinguish between dqi...

I'm having trouble with the following: technicolour predicts new massless techniquarks. The technicolour force breaks the chiral symmetries of these quarks and goldstone bosons emerge. But goldstone bosons are massless? Goldstone bosons are eaten by W and Z and thus W and Z acquire mass...

Homework Statement y(x) = C1sin(2x) + C2cos(2x) Homework Equations y(∏/8) = 0 The Attempt at a Solution C1(1/2)(√2) + C2(1/2)(√2) + 1 = 0 The book jumps to the equation below and I'm having trouble figuring out how they got there. C1 + C2 = -√2

Homework Statement If I have a 3*3 grid, or 3*3 matrix, which records clicked points. I.e. Pattern T = [1,1] = 1 [1,2] = 1 [1,3] = 1 [2,1] = -1 [2,2] = 1 [2,3] = -1 [3,1] = -1 [3,2] = 1 [3,3] = -1 or 1 1 1 -1 1 -1 -1 1 -1 What is the best way to statistically...

OK, a proof for this simple result. Let's take a circle of center O1 (point in the plane) and radius R1 (length of the radius). Call this circle C1. We define the number π1 as (circumference of the circle C1)/ (2R1). Let's take another circle of center O2 and radius R2 called C2. Define...

In the last 2 weeks we've begun learning about eigenvalues/vectors. It will come up in my exam in January so I'm trying hard to get my head around this. I've tried various different sources to learn this but I'm hoping someone here can offer a different view on it. Basically, I can work out the...

I'm looking for a very basic book on physics,basically starting from scratch. I'm in college right now taking policing but I'm kind of having a change of heart. Any books geared towards marine engineering or navigation would be useful too.

I have some questions concerning the tendency of a system containing two different metals and water to corrode. This is coming from several similar discussions on another forum, concerning water cooling of computer components. There seems to be a lot of repeated dogma, which may include...

Hello experts! I have some question related to this configuration of BJT. 1)Why we use capacitor at the base of the circuit?(Answer: To decouple DC so that our signal that is reaching to base of the transistor is not to be DC shifted that's why it is called "Coupling capacitor". If it is...

Please help! Also, please correct any misunderstandings which I have. I have read about electricity basics and what happens on the atomic level until I have read ideas which compete with each other. 1 - I've read that the word electricity applies to particles with a negative charge (more...

Hi, I am currently completing undergraduate studies in electronics & aiming to pursue MS Aerospace from US. Can anybody please tell about good books for Aerodynamics & Flight which cover the basics for someone without a fluid dynamics background ? Thank you.

Can anyone tell me the basics of Quasar? Note: Means that how it is created when there is only one dimension exists in a black hole and what is the reaction that occurs which emits so much light that it can be seen through millions of light year.

I have a very weird assignment/project. The link http://www.cns.cornell.edu/documents/JeffKashIBMTJWatsonResearchCenter.pdf" has an eye diagram in pg4 of the slide. That eye diagram has been constructed using copper wired interconnect for chip to chip communication. Now, I have no idea what is...

Hey there everyone! I posted here a while back with basically the same query but I can find the post and I'm now ready to get my *** into gear! I'm 21 years old, In school i wasn't the best behaved child, I regularly skipped it which i most certainly regret now! Anyways, in Maths i managed to...

Hi, For experts among you it might be trivial, but I am not exactly "at home" here :confused: so, here it goes: 1.Does the "cut off frequency" in waveguides apply to all incident angles of electromagnetic waves propagation through the waveguide or not. 2. Does the shape of cross-section...

I have some questions about thermodynamics. When liquid water is vaporized at constant pressure, the internal energy of the system may increase by fewer calories than used to vaporize the water. Is the difference in calories applied to work of some sort done by the system, or is the heat lost...

hello all, could u pls tell me what a hollow shaft is?

I have a slightly bothersome problem with my current body of physics knowledge. I got A's and B's in all my upper-level physics classes and I know the math, at least as much as I need to know to solve the problems, so it's not like I don't know ANYTHING about what I learned. But it was all...

Carton of 10 Eggs, with 2 Bad ones. So we know the makeup of the population. If we select 3 eggs at random. What is the probability we have selected both bad eggs? and What is the probability we have selected at least one bad egg?. Ive used tree diagrams and figured out the...

Homework Statement In control engg. we define the order of the system as (or atleast as far as I have understood as) Nu/s^m*(s+a)(s+b)... I cannot understand the base for such classification? Why are we classifying systems based on the number of poles they have on origin? Homework...