Explain Definition and 1000 Threads

What is exactly one Coulomb? Wikipedia says "One coulomb is the magnitude (absolute value) of electrical charge in 6.24150965(16)×10^18 protons or electrons." It also says " It is defined as the charge transported by a steady current of one ampere in one second" But also 1 proton has a charge...

Hi. I would like to know where can I find detailed information on how is a mirage created when you place an object between two parabolic mirrors, with one of them opened. You must know about this device: http://www.optigone.com/mirage_images/hologramWhand.gif In other words, I would like...

not to be impolite, but i truly view randomness in reality as something you can trick your kids into accepting along with santa, the tooth fairy etc. when compared to causality the idea of true randomness existing in reality seems incredibly weak to me. is there any simple logic which can...

I'm working on a question for a problem set that has the following hint: For any function A: \frac{d^{2}A}{dr^{2}} + \frac{2}{r}\frac{dA}{dr} = \frac{1}{r^{2}}\frac{d}{dr}(r^{2} \frac{dA}{dr}) I don't understand how this is true; this is how I try to show that both sides are equal but...

Can Someone Please Explain Hermitian Conjugates To Me!? I'm working on some problems about the Hermitian of a Harmonic Oscillator - I keep coming across the Hermitian written in a form with A[dagger]A and similar things - when I've looked in textbooks and online I find it explained using...

in explaining the interference pattern that happens in double slit, single particle interference - some of the interpretations, for example De Broglie–Bohm interpretation: assumes that (some sort of) "waves" travel through both slits simultaneously and interfere with each other the...

How far do you travel if, starting from rest, you accelerate at 1.5 m/s2 for 4.0 s, then coast for 8.0 seconds, then decelerate to a standstill in 4.0 s? I am totally confused about the fact you accelerate and then coast, and then slow down. We have 3-t's in this problem and don't know what...

To those who are open to PSI existing. Which theory do you believe may explain PSI (paranormal phenomena) such as telepathy, clairvoyance, psychokinesis, near-death experiences or apparitions etc? John Beloff a well known parapsychologist concluded that PSI occurs becuase of dualism ie the...

It's about GARCH(1,1) processes (mainly it's all statistics and probability). Anyway, there is the section of a book (link below) that is confusing me: Where does "E[ln⁡(β+αz_t^2)]" come from (on page 319, the "second" page)? My other question is why does it say that "ln⁡(β+αz_t^2) holds...

Source. Can someone explain what this means? It seems like it would be a big deal if something that should be a conductor, wasn't. But the word "measured" gets me confused. I start think of quantum mechanics, and maybe I am right to do so, but not sure so just a clarification of what's...

Can some one Fully explain reflection for me, because i am reading my book and i read about wavelets and I DONT UNDERSTAND THAT, so can some one explain it all PLEASE

How does one use ratios of gas densities to estimate the molecular mass and find the molecular formulas?

can gravity be destroyed" explain "can gravity be destroyed" explain

Hi guys & gals. I work as an electronics engineer in an R&D department, and a discussion with a colleague of mine left me a bit dumbfounded. Let's say I have a circuit where a high-frequency AC signal is lead to two different paths. In one path the signal remains unaltered, and in the...

hi i am not a newbie to physics but some terms are quite confusing such as inertia, momentum and many other similar ones can anyone explain what actually the momentum is so that my concept become more clear about it.. thank you

Homework Statement Mathematica's calculation of ∫0Log(2)Sin[(\pi/2)e2x]exdx = -FresnelS[1] + FresnelS[2] Remembering that FresnelS[x] = ∫0tSin[(\pi/2)t2]dt, You announce that a transformation you can use to help explain Mathematica's output is that every time x goes up by one unit, t=...

Homework Statement A sphere of radius R has a charge Q distributed uniformly over its surface. How large a sphere contains 90 percent of the energy stored in the electrostatic field of this charge distribution? Homework Equations U= 1/8pi integral E^2dv. The Attempt at a...

Can someone explain how the Stark Effect works in Layman's terms? I'm trying to understand how an electric field can cool down atoms. What is the electric field doing exactly to the atoms? How is it lowering the atomic energy levels? Is there a difference between Stark Shifting and Stark...

Homework Statement The proofs: show (A')^-1 = (A^-1)' and (AB)^-1 = B^-1A^-1Homework Equations The Attempt at a Solution for the first one: (A^-1*A) = I (A^-1*A)' = I' = I A'(A^-1)' = I but I am not sure how this proves that a transpose inverse = a inverse transpose... the second i have...

I have a BS in Economics and Physics, I've been out of school for a year now and I really want to get a PhD in physics but I'm having trouble narrowing it down to a particular area (i.e. particle, material, astro, experimental, theoretical, etc. ), which in turn is slowing me down in my search...

Homework Statement Explain graph of y=√x The attempt at a solution I've done the graph on an online graphing calculator: http://s2.ipicture.ru/uploads/20120117/7JtQ5VD2.png But i don't understand why there is no equivalent reflection below the x-axis, in the 4th quadrant. From y=√x, if x=4...

In de Broglie–Bohm theory (or should we say hypothesis): the wavefunction travels through both slits, but each particle has a well-defined trajectory and passes through exactly one of the slits. The wave function interferes with itself and guides the particles in such a way that the particles...

Thermal radiation question. Please help me explain the theory! I want to delete this post.

Homework Statement Explain why if your car is tuned to FM, it cuts out when you enter a tunnel but doesn’t if you are tuned to long wave reception. (λ of FM: 3m, λ of long wave: 1500m) Homework Equations The Attempt at a Solution Well, what I think is that.. As the λ of the long...

Homework Statement This is not a homework question, as we just started getting into SHM, and I want to be 100% clear what this equation means. Can someone please all the parts, or have a site that really explains this formula? Homework Equations The Attempt at a Solution

first thing, that you might want to know is, that i am not from an english-speaking country, so please, excuse my grammar...;-) Homework Statement hi i have a problem here and i already know the solution, but the thing is, that i do not understand it. let's see: the first question was: the...

Hello guys! I am new here, I have one question, I have in my mind, I want to knw the description as well as want to understand that how we can use BCD Adder, in our digital electonics. topic. can anyone explain this thing for me??

Why when explaining/introducing QM things get explained with the <bra|ket> complex vectors... then somewhere in between they start using functions (psi).. It gets confusing when epxlanation start switching between them back and forth... My understanding is they are the same thing... Is...

Can someone explain to me what a "function arrow" is? In particular, what this may mean: I = [a, b] f : I --> R I'm just trying to understand what the arrow means. Or if we have R --> R what that would mean. Thank you!

I want to know what is happening at micro-level, how macroscopic tumbling of the solution can actually break a chemical bond?

Good books that explain the "Why" element. Hi there, I'm in a bit of a pickle. I'm currently in what I think is the equivilent to the American Senior year. I am kind of angry with my maths teacher. While she is good she "Teaches to the exam". It really nettles me. Does anyone know any good...

This is a thought experiment but not very academic. Assume a satellite solar panel was critically designed in such a way that even 10% increase in mass would result in hinge attachment failure. Assume some inertial frame (A) in a distant planet or space ship, at some part of its course it...

How can there be any shifting of light frequency due to dopler effect? Frequency is just a fancy way of stating 'wave' or, as depicted on all explanitory diagrams, a sinusoidal wave. Each cycle of the wave represents one part of the total waves measured in a given amount of time which is the...

i am in first year can anyone explain about internship ?? i am in engineering physics first year can anyone explain me about internship

Watching Brian Cox "BBC - Professor.Brian.Cox.A.Night.With.The.Stars - 2011" After 34 min he starts to talk about Pauli exclusion principle No electron can be in the same energy state he says. This is not just true for an atom a molecule or the diamond he is showing. No this goes for...

This sounds very hokey (in a metaphysical way), and I am sorry for that. It isn't, it is a very serious question... A number of years ago a friend gave me a "healing wand." It is nothing more than hard copper (water) pipe(maybe a foot long?), and a natural quartz crystal "point". But...

Please explain -- total electic field Ec + En within the coils must be zero Hi This is from the text University Physics. In pg. 1035, chap 10, in order to justify the use of Kirchoff's rule to analyze circuits containing inductors it is written : Let's assume we are dealing with an inductor...

If most of the mass/energy of a proton is due to the kinetic energy of its quarks and gluons, rather than interaction with the Higgs field, then how can we explain its inertial mass, i.e. its resistance to acceleration, as being due to a drag induced by the Higgs field? Alternatively imagine...

I boiled the milk in milk cooker and i opened once to take some milk out. Remaining milk was there in the cooker and cooker is tightly closed. I placed the cooker over the stove and stove is switched off. when i get up in the morning, i can see that cooker has fallen down from the stove..is...

This was a question from my C++ midterm. I see an infinite loop, but the correct answer is 12. Can anyone explain this? Question: What is the value of i after the loop exits? int i; for(i=0; i < 10; i++) i+=3; i=1;

So the principle of equivalence states that any effects due to acceleration must also occur with gravity, as it's impossible to tell the two apart. I get that, but it assumes that gravity exists and you know how much it accelerates objects. But that explanation just predicts what will happen...

Homework Statement My professor gave us this problem: Convert the limit to an integral: \lim_{n\rightarrow inf} \frac{1}{n}(\sin(\pi/2) + \sin(\pi/2) + ... + \sin(\pi)) he said it was right endpoint from [0,π] then he set Δx = \frac{\pi}{n} then \lim_{n\rightarrow inf}...

Dear forum I have set AS physics (in england) coursework where the students drop squash balls at different temperatures and measure the bounce height. Yes, I know it is mentioned a lot but haven't so far found a good explanation. Their results will show that the higher temperature...

Explain why this is no good as a definition of continuity at a point a (either by giving an example of a continuous function that does not satisfy the definition or a discontinuous one that does): Given ε > 0 there exists a \delta > 0 such that |x – a| < \epsilon \Rightarrow |f(x) – f(a)| <...

Space time Geometry and GR, taken from lecture notes http://www.mth.kcl.ac.uk/courses/cm334.html http://www.mth.kcl.ac.uk/courses/cm334/Lectures0910.pdf from pages 3 and 4 Newton's universal law of gravity is getting modified. it says using the result, from where this result...

I've read about the class equation on Herstein's abstract algebra but haven't understood it well. Would someone here explain the class equation to me and give a short proof for it and then tell me where it can be used?

Can anyone please explain schuler cycle, please don not start explaining with same old pendulum with the length of radius of Earth stuff. why is it required ? what is that all about ?

Homework Statement I already have the solutions, just don't understand one step Let (n_k)_{k=1}^{\infty} be a sequence of integers n_1 < n_2 < n_3 < ... Then n_k \geq k \forall k = 1,2, ... In particular n_k \to \infty when k \to \infty Prove this is true 2. The...

Please Explain this?! hey, ok so i was going tthrough my textbook and following some examples hwne i cam up to this: Force of Thrust = Ft/ delta T = 6N / 3.48s =1.7 N but it doesn't say what the equation means. can someone...

Why is a magnetic field "a field-of-force in space" while a gravitiational field is "not a field in space, but a curvature of space itself"? Why can't we describe and explain EM repulsion and attraction the way we explain gravitational attraction? Why don't we say that the presence of a charge...