Explain Definition and 1000 Threads

Homework Statement I have my notes below, however I don't understand the part where it says that: xp(t) = A, where did this come from? http://img142.imageshack.us/img142/4733/questionub.th.jpg Homework Equations The Attempt at a Solution

Homework Statement Two sequences are defined by Xn+1 = 3Xn + 4Yn ; Yn+1 = 2Xn + 3Yn What is the approximate value of Xn/Yn as n increases? Homework Equations none The Attempt at a Solution My solution was to say that as n tends to infinity, both Xn, Yn tend to infinity...

Just need to know a definition :/

I was thinking about looking at getting a minor in another branch of study and I don't really understand what this means in regards to your overall education. Whenever I try to research minor degrees I either find a website that tries to sell me one or a site that assumes you already know what...

I'm going to use the time traveling twins example to try and explain the crossroads I'm at with special relativity. The one twin is back on Earth while the other twin is traveling to a star 10 light years away at .8c. We calculated how long it would take on the earth-star frame of reference, it...

I don't really understand how the Earth's Magnet work. For example, when the question say the electron is moving horizontally to the east. And then i asked someone, they said the horizontal actually is the vertical. And why does the magnetic field go from south to north, isn't north to south...

I were trying to figure out the "logic" why gravitation (acceleration) causes time dilation. While at "velocity time dilation" its because (e.g) light in light clocks must travel longer distances. As seen on those pics: http://en.wikipedia.org/wiki/File:Time-dilation-001.svg...

I posted this in the geometry subforum, but I think that might have been the wrong place to post this. Given two triangles with vertices A1, B1, C1 and A2, B2, C2 respectively. A1A2, B1B2, C1C2 are extended to meet at a point V say. Now, B1C1 and B2C2 are extended to meet at L, A1B1 and A2B2...

how we can explain the differential of lagrangian is a perfect ?L dt

Homework Statement I have the answer completed, but not using the matrix method. That is what I am confused on, I am unsure on how. Required to use matrix method. In figure, a real inverted image I of an object O is formed by a certain lens (not shown); the object-image separation is d =...

Given two triangles with vertices A1, B1, C1 and A2, B2, C2 respectively. A1A2, B1B2, C1C2 are extended to meet at a point V say. Now, B1C1 and B2C2 are extended to meet at L, A1B1 and A2B2 meet at N and A1C1 and A2C2 meet at M. Prove that L, M and N are concurrent. Proof (as given in text)...

I want to know about the internal capacitance of transistor cbc and cbe

For a long period of time the switch S is in position “b”. At t = 0 s, the switch S is moved from position “b” to position “a”. ....3 M ohm l---------------^^^^^^-----------------l l........…......l l...1 M ohm...4micro F.....l b l---^^^^^^^^^-------------ll---------/ i...

In spite of the widespread ball point pen, I still use a fountain pen for calculations.. One day, I ran out of ink while writing (duh..) and opened the cap of my ink bottle to refill my pen. Now, as I opened the cap, a thin film of ink was formed around the mouth of the bottle.. in other words...

Hi, I'm Yr 13 and just wanted to do some further reading/exploring. So i understand that the zeta function is something to do with summing up like this: 1/ (1^s) + 1/(2^s) etc etc Now, I just want to know what are non-trivial zeros and trivial zeros? I just want to be able to understand this...

Okay, basically what I'd like to be able to do is have some sort of "universal" RF (FM) audio circuit. Actually, two: One for transmitting, and a separate one for receiving. (I'd prefer to keep it simple, and therefore not a transceiver circuit. This is for one-way communication.) My ideal...

Homework Statement I was supposed to use my calculator to get the answer of secx=4 for the range 0 to 2pi. I use the Ti-89. Homework Equations calculator format solve (secx=4,x) The Attempt at a Solution I get an answer, but it has a weird notation at the end of 2pi...

Let speed be s s^2 = 4^2 + 9^2 s^2 = 377 s = 19.4 mph Ө = Tan^(-1) [ 19/4 ] = 78.1° 3 figure bearing is thus 180 ° - 78.1 ° = 101.9 ° 109.1 ° = N 11.9 ° W Why 109.1 ° = N 11.9 ° W.

I DO NOT like this least time hocus pocus. I prefer the idea of causality. I just CANNOT stomach this idea. Here are my arguments (italicized text) almost verbatim from my notes against what I read (in bold). Someone please explain to me the whys and hows. Arguments against Fermat: "Given...

Could someone explain the "Schrodinger's Cat" experiment to me? Hello, I wanted to have an idea of what this experiment is. I just passed my 10th grade and so I don't quite grasp the meaning as it's been explained in Wikipedia. To quote from it: "A cat, along with a flask containing a...

can anyone explain kers in formula one cars? like how it works on a mechanical level. and the difference between flywheel and electrical kers.

So there's this guys argument that Newtons 3rd law is wrong: "When I say that for every action there CAN'T be an equal an opposite reaction, it is a FACT. It's mathematically IMPOSSIBLE to have an EQUAL reaction to every action. Because then NO action would succeed. ALL actions would be right...

I read interesting article.What do you think about it? New Law of Physics Could Explain Quantum Mysteries Tim Palmer, a weather and climate researcher at the European Centre for Medium-Range Weather Forecasts in Reading, UK, has been interested in the idea of a new geometric framework for...

I understand that when , say, several protons and neutron come together to from a nucleus they loose some mass and that this mass is lost as ENERGY as proven by Einstein. But does that actually mean that the protons and neutrons become a bit lighter? And is this what accounts for the mass defect...

Can someone explain magnets at the subatomic level to me? According to wikipedia, many of the electrons' spins are oriented in the same direction; what happened to the Pauli exclusion principle? Is it something to do with the electrons being delocalized that changes the other quantum numbers? Is...

Homework Statement Pick any numbers that add to: x + y + z = 0 Find the angle between your vector \textbf{v} = (x, y, z) and the vecor \textbf{w} = (z, x, y) Explain why \textbf{v}\bullet\textbf{w} / ||\textbf{v}||||\textbf{w}|| is always -\frac{1}{2} Homework Equations Cosine...

Hi, So I am an undergraduate math major who goes to a state university, and often time I get into conversations like the following: My friend: "What are you taking this summer?" Me: "I'll be taking (abstract) linear algebra." Case 1: My friend: "Hmm... 'linear' and 'algebra'? That...

This isn't a paranormal claim, I don't know what caused it but. I was watching a youtube video (while at the same time saving it to my computer with the "Replay Media Catcher" program.). I turned off my electric heater (connected to a differnet power socket), and the sound in my youtube video...

Can anyone explain about electron doping and Hole doping

Hi all, I am not so good in physics. Plz forgive me if i am totally wrong. However, i just want to understand the time dilation thing. I referred the net, but couldn't get a convincing answer. Please explain how the time in two clocks in different inertial frame of reference can show...

parametric and symmetric equations in R^3?? Homework Statement Recall that there are three coordinates planes in 3-space. A line in R3 is parallel to xy-plane, but not to any of the axes. Explain what this tells you about parametric and symmetric equations in R3. Support your answer using...

I suppose the real title should be, "can relativity explain the NEED for Dark Matter"? Now I'm not a physicist, so if I get a detail wrong here or there please do not get stuck on that but rather try to answer the question... It is my understanding that dark matter is "needed" (in one...

I need an explanation that relates the equation to what I learned about the dot product of two vectors being the magnitude of the parallelogram formed by the two vectors in 2D or similarly by the paralleliped formed by three vectors in 3D. I want to know for instance if the resultant is...

Homework Statement How many significant figures in each?: -214 -81.60 -7.03 -.03 -0.0086 -3236 -8700 I don't quite understand this (I'm self studying, need a little help :) ) If got them all right then can someone explain the concept of significant figures? I hate knowing only...

Please explain what an "axis of inertia" or "principle axis of inertia" is! I have confronted these terms in a paper about molecular quantum mechanics, and they are completely unfamiliar to me. Can someone help?

Would anyone care to explain this equation/model to me? Here is the link: http://ocw.mit.edu/NR/rdonlyres/Physics/8-033Fall-2006/30327616-EA68-417E-BFE8-78D72DEDDEC6/0/lecture9_lagrang.pdf To be a little more specific, it is on the fourth slide, and is labeled as "The Standard Model...

An understandable explanation please.

Wilson's Theorem: (p-1)! ≡ -1 mod p Statement: As an immediate deduction from wilson's theorem we see that if p is prime with p ≡ 1 mod 4 then the congruence x2 ≡ -1 mod p has solutions x = +-(r!), where r = (p-1)/2.How do I plug in p ≡ 1 mod 4 into wilsoms theorem so I can see this? I'm...

Hello; This is my first post, and I am not sure I am posting in the right forum, if not, please move my post and I apologize. Ok here goes: Bear with me as I am not a professional; I never learned physics, my work doesn't involve physics (well, it does a little as I code video games and...

to better understand the expansion of universe, i probably need to see a well designed animation. neither in stretching rubber nor inflating baloon models i don't understand how does Hubble constant of 74kps fit on them. actually to apply Hubble constant i can only imagine one model and that is...

explain this C programme?? #include<stdio.h> void func (int x); void func(int x) { if (x>0) func(x-1); printf("%d",x); } int main() { func(4); return 0; } this C programme gives the output of 0 1 2 3 4 can anyone explain me how this happens I am totally confused ...

hi, i want a book that introduce the heading of quantum maths and explain their from basic to advanced. if this book there is in internet free, please send it's link.

After the link to TED was posted a few threads below, I began to browse through the videos and I found this one which I liked a lot. http://www.youtube.com/watch?v=5hJCxSiH4ts&feature=channel_page I got questions 1 and 2 right. But the 3rd and 4th questions wrong and along the lines of the...

Hi everyone ! I´m posting as I couldn´t find any information on the forum, or maybe I can´t find a way of searching. My question is based on a discussion me and my girlfriend had about "making yourself heavier", and we tried a little experiment: First I lifted her in my arms without any...

Hi I'm trying to get my head around this plot of the cosmic microwave background radiation. http://www.astro.ucla.edu/~wright/CMB-LCDM-w-WMAP.gif I've been searching all around to find out what exactly a angular power spectrum is. I know what an ordinary power spectrum is. I'm a second...

I was wondering, why is it that the planets orbit in elipses? I find it strange that it's path would be eliptical, is it the result of some kind of force of nature keeping it fixed in it's orbit? Or is that simply the way it is? I can't help but feel there's something deeper to it...

Hello everyone, Right now I'm working on an inclined plane problem. "a) The worker exerts a force(F) of 86 N. How much work does he do? (b) How much work is done by gravity? (Be careful with the signs you use.) (c) The coefficient of friction is µ = 0.20. How much work is done by...

Electrical permittivity...in mathematical terms, i.e I need the derivation...WITHOUT using 'curls'. Didn't find it online.

Hey guys. I've started studying Physics at home, but only the theory side with a little mathematics. So i would like to try, if i can, to introduce a little calculus to my work. But the problem is i find calculus a mind boggle, i understand All the GCSE math that i did. Could someone explain to...

so apparently 3^-1 mod 5 = 2 so (1/3) mod 5 = 2 I don't get how this works, can someone explain?