Explanation Definition and 961 Threads

Its the part c question...which states C) Suppose we made V = 0. Find the new current running through the 5.00 ohm resistor.So I just took the biggest loop and did it this way Sum of V = 0 So starting at the upper left hand corner of the circuit -3A(15 Ohms) + 50 V + I (5) = 0 -45 + 50 +5I...

Ok try to review for the finals but I need help in understanding this problem. So I can say that there is a resistance, 2 capacitors in series, and voltage source (Vo). Vo = 20.0 V R = 5.00 kilo ohm C1 = 12.0 micro F C2 = 4.0 micro F Switch is closed at t = 0. How much energy will...

Homework Statement What is the reason for energy bands in solids? Homework Equations The Attempt at a Solution because of close proximty of atoms

Homework Statement 2iz^2 - (3-8i)z -6 + 7i Homework Equations z = \frac{-b +/- \sqrt{b^2 - 4ac}}{2a} The Attempt at a Solution Right, here goes... a = 2i b = -3 + 8i (is this correct? Or would it be better to leave it as 3-8i?) c = (-6 + 7i) so using these: z =...

Homework Statement I am giving a short talk on supersymmetry for my intro to high energy class, but I do not have the time to read an entire book on the subject. Most resources I have found go into much more depth than I need, but these seem to be the only resources. Can anyone help me with...

Homework Statement 1. http://img16.imageshack.us/img16/61/falsec.th.jpg 2. http://img16.imageshack.us/img16/5558/false.th.jpg Homework Equations The Attempt at a Solution This is false, however it seems true.. I see no reason why it is false.. Can someone please help me to...

Could someone give me a good explanation as to how superconductivity works. Feel free to be very technical. Thanks :smile:

Subject: A Baffling Quote from Einstein, badly requiring explanation All sources I've consulted indicate that Einstein reconceived gravity in General Relativity by discarding the prevailing, intuitive, Newtonian view of it as a 'force' accelerating objects, and daringly envisioned it purely...

Can someone explain all the known paths a star can take from its birth to its death? This is what I know so far. Please correct me or add things where they need to be in the list 1) Hydrogen gas, clumps together by gravity. 2) Hydrogen atoms bump against each other and these collisions...

Homework Statement When you have something like and you want to use the pythagorean's theorem identity but let's say i do it with the 3rd term in the parenthesis, then would this be valid and what about this is this also valid? Homework Equations N/A The Attempt at a...

Linear Algebra true/false explanation. :) Homework Statement True or False: Is it possible to find a pair of two-dimensional subspaces S and T of R3 such that S (upside down U) = {0} ? Homework Equations The Attempt at a Solution My understanding: upside down U =...

I don't think this goes under H/W questions, as it's not a specific question needing solving, or a proof, etc. Getting back to the point, anyone know any good websites or sources that give a good explanation of determinants? I mean what they do, why they do it, not just how to do it. I googled...

I would appreciate an explanation of Yukawa potential

Did native americans die overwhemely from diseases brought by the First european immigrants or were the native americans population dwindled down to insignificance because of the genocides perpetrated on the native american by the europeans?

So, I know the "correct" answer to this problem, but it makes no sense to me at all. Why is the following the case? Homework Statement A railroad hopper car has mass 40,000 kg when empty and contains 50,000 kg of coal. As it coasts along the track at 4 m/s the hopper opens and steadily...

Hi all. I'm reading about time-independent perturbation theory for degenerate states in Griffiths' Introduction to QM. I have a question on the things he writes in chapter 6.2, page 269. What does he mean by the so-called "good" linear combinations? I hope you can shed some light on...

My physics master at school (1970s) said that if you hold your hand in front of your eye whilst looking at a bright light, you can see lines appear in the tiny gaps between the fingers. He said that though some people thought this was slit diffraction, they were mistaken, the effect actually...

there is a continues function f(x) and bounded on (x_0,+infinity) proove that for every T there is a sequence X_n=+infinity so lim [f(x_n +T) - f(x_n)]=0 n->+infinity i was told: uppose that \lim_{x\to\infty}f(x)=a. So we know that given any \varepsilon>0 there exists a \eta>0 such that...

regarding this defintion http://img515.imageshack.us/img515/5666/47016823jz1.gif i was told that Remember that if x_n is bounded then \limsup x_n = \lim \left( \sup \{ x_k | k\geq n\} \right). The sequence, \sup \{ x_k | k\geq n\} is non-increasing, therefore its limits is its infimum...

heuristic explanation of why quantum field theory imply antiparticles I'm looking for a heuristic explanation of why quantum mechanics plus special relativity requires antiparticles, Does anybody want to take a crack at it? Or am I asking for the impossible?

Homework Statement Hi, I'm taking AP Physics in high school, and the explanation I wrote is based on a demo in class, something like this picture: When the wheel is spinning, there is an angular momentum facing away from the string along the axis of rotation of the wheel. The gravitational...

a particle is moving along the X axes under the influence of a conservative force with a potential energy. by this graph : http://img376.imageshack.us/img376/5609/82453845uw5.gif 1.describe how the particle moves with E1 energy where E1>U1 which comes from the left x<-a and...

1. I'm extremely confused with how they' re originated, basically explain how the aurora borealis and aurora australis are formed.

Hi folks I was wondering if someone could please help me with the following: Is the explanation for radioactive decay (if it is not "induced") the increase in entropy, and is it true that an activation energy must be overcome (if so, does that mean that it is not possible for an unstable...

I seem to recall reading a post a long time ago (that I cannot find) that gravity in the Newtonian limit (eg the Solar system) can be completely explained in terms of gravitational time dilation alone. In his book, Gravity from the Ground up, Schutz argue that All of Newtonian gravitation is...

I'm looking for a simple physical explanation of the lowest energy level in atoms, so I can provide a brief explanation to interested laypeople (not to mention just to help myself understand better). Does anybody want to take a crack at it? Or am I asking for the impossible? Since electron...

Homework Statement http://www.webassign.net/walker/p11-78alt.gif An 85 kg person stands on a uniform ladder that is 4.3 m long and weighs 65.0 N. The floor is rough; hence it exerts both a normal force, f1, and a frictional force, f2, on the ladder. The wall, on the other hand, is...

I'm looking for a simple physical explanation of the discrete energy level in atoms, so I can provide a brief explanation to interested laypeople (not to mention just to help myself understand better). Does anybody want to take a crack at it? Or am I asking for the impossible?

I'm looking for a simple physical explanation of gravitational time dilation, so I can provide a brief explanation to interested laypeople (not to mention just to help myself understand better). Does anybody want to take a crack at it? Or am I asking for the impossible?

Hello every1.. I would like just sum help in unerstanding how a voltage comparator works.. I tried to read journals.. books.. but till now, I feel so lost.. can someone just give me a simple explanation of the SIMPLEST voltage comparator? sumthing to help me get on with it... I'd appreciate...

Hi All, Consider please the situation where an electron is moving to the right with velocity Ve parallel to a horixontal wire in which is found electric current I. For the sake of definitness, let positive charges inside the wire go to right and negative go to left, with velocities of equal...

Qn:Why do bubbles like this form? -My guess is that intially air trapped in the liquid before cure expands in all direction(to maintain equal pressure) during curing, as curing shrinks the epoxy, causing bubbles to form. (Or is it the heat which expands it?) Microscope picture of bubble...

Hi Im trying to revise up on half suspension systems and I found this useful link. Their are 4 equations but I was wondering if someone could explain the equations for me (as it just tells you what they are without giving any understanding) especially equation 1...

How do I explain this: Let p be odd prime explain why: 2*4*...*(p-1)\equiv (2-p)(4-p)*...*(p-1-p)\equiv(-1)^{\frac{(p-1)}{2}}*1*3*...*(p-2) mod p. Relevant equations Gauss lemma wilson's theorem [(p-1)!\equiv-1 mod p] The attempt at a solution pairing? need assistance...

Can someone please explain to me in brief detail as to what each expression means for the given formula:- V(in)=V(max).sin(wt) and to how this formula works? It is a formula that has been given to me in order to work out time at which a waveform=V(min) for a dc smoothing circuit with a...

Can someone please explain to me in brief detail as to what each expression means for the given formula:- V(in)=V(max).sin(wt) and to how this formula works? It is a formula that has been given to me in order to work out time at which a waveform=V(min) for a dc smoothing circuit with a...

Hi! This is my first post, and maybe there is already a thread about this, but I couldn't find one. I found this forum through StumbleUpon. My question is, what exactly is e? How did Mr. Euler get to this number? I am from germany and recently graduated in a "gymnasium". Somewhat like the...

Hi there Can anyone provide me with an explanation of what a wavenumber is, and how it can be used in determining the extent to which energy is dissipated during turbulence (ideally in the context of the ocean)? I am aware of the basic definition of a wavenumber (i.e. the reciprocal of wave...

Homework Statement Hi all. I'm reading about spin 1/2, and I am having a hard time understanding it. I hope you guys can fill the gaps. Here is where I stand at the moment: The basis vectors are "spin up" and "spin down" in the direction of the z-axis. Thus we have for spin 1/2 in the...

Hi everybody Actually i need to calculate a cristallite nanoparticles size by using my XRD measurement results. I looked in some sites and published papers, folks are used an equation called Scherrer equation to calculate the radius of a nanoparticle. I've found in an another forum this...

I was sitting in my kitchen this morning at 8:10am eating breakfast with my mom and sister present in the room when a glowing yellow & orange light appeared directly over the counter table across the room for no more than 2sec. At this same instance our electric garage door started going haywire...

Hello. I have a question regarding photoelectric effect. My textbook says that when photoelectric effect experiment was first performed, physicists could not explain the outcome with classical physics (e.g. maximum kinetic energy depends on frequency of light, not intensity). My question is...

How does a cathode heater work? Can't seem to find a straightforward explanation anywhere.

My left hand shakes whenever I'm holding something with it. It's not just small movements, it really is shaking abnormally. I don't know how long I've had this, I noticed it yesterday while holding my umbrella. Could this be temporary? I don't know if it's worth going to see the doctor over it.

i don't have a problem just a little confusion. what exactly does the i hat and j hat notation mean when given a vector problem. such as \vec{}a= 0.023 \hat{}im/s^{}2 + 0.046 \hat{}jm/s^{}2 what is this statement actually saying. i know what i need to do with it, but don't quite grasp...

Homework Statement http://www.cramster.com/Answer-Board/Image/20073231626286331026398833900007956.jpg This is not problem. I just having trouble understanding the basics. Please just tell me right away, don't 'assist!' I trying to understand the right hand rule. Here are to...

Homework Statement Why do you lunge forward when your car suddenly stops? Why are you thrown backwards when your car suddenly accelerates? Explain using Newton's laws Homework Equations ? The Attempt at a Solution Because of your seat belt, you are attached to the car, causing...

In chapter 4, Kittel is setting up the differential equations for the forces involved in lattice vibrations. I understand the concept, the only problem I'm running into is why he chose the solution he did. Here goes: He states that the differential equation is...

ok why does surface area = ( y) ( 1+ f ' (x)^(2) )^(1/2) equal surface area = (x ) (1+ f ' (x)^(2) )^(1/2) the simplest explanation please.

Hi, I seem to recall reading a post a long time ago (that I cannot find) that gravity in the Newtonian limit (eg the Solar system) can be completely explained in terms of time dilation alone. Is that true and if so, how does that work?