Explain Definition and 1000 Threads

http://tinypic.com/a/2im4z/3" If you have not been bitten with a life long love of two wheel rapid transit systems then this thread is not for you... Some additions/replacements to the "Work in Progress..." The top two left images, thrust/hp/torque, the top two right images are of a...

Homework Statement

If let's say we have the following expression √(x^2 - y^2) If I wanted to factor out x, then why can't I just take x out because a square root of a square is the base. x√(1 - y^2) But it turns out that the answer to this is incorrect and the answer to factoring out x is. x√(1 -...

Hey everyone I just started an engineering course and have been given a few questions but I am struggling with this one as i feel that i have not included all the info that should be there. Can someone tell me briefly what they would explain the term permittivity as and how they think it would...

Can someone explain to me the R formula?(expressing \displaystyle a cos \theta + b sin \theta in terms of R sin(\theta + \alpha) ) I don't really understand my textbook at all which jumped straight to the questions. Could someone please enlighten me on the logic behind this concept and how...

Can anyone explain how to draw a leading edge circle of an aerofoil. Where is the center and what is the radius of the leading edge circle

http://www.nasa.gov/images/content/498884main_DF3_Fermi_bubble_art_labels.jpg http://www.nasa.gov/mission_pages/GLAST/news/new-structure.html Could these structures account for the dark matter, or is the density profile inconsistent with two big blobs of matter/energy on both sides of the...

Please explain this paragraph from "The Selfish Gene" edit: I just noticed that I misspelled 'Selfish' in the title. However I have no idea how to edit the title after posting so kindly ignore the mistake. I have been reading "The Selfish Gene" by Richard Dawkins and all the while he looks...

Homework Statement As the title says. Homework Equations mentioned in solution The Attempt at a Solution Let Sn = {(1+1)/(1+2) , (1+2)/(1+4), (1+3)/(1+6), ...}. If ∑(1+n)/(1+2n) is convergent, then lim n-->∞ Sn = 0; to put it another way, there exists an N so that whenever n ≤...

I've taken basic college physics and chemistry courses where I learned about entropy and thermodynamics, and I can tell you that I don't know that much :) That's my background. I understand that entropy is a description of 'randomness' and possible 'states'. When I wash my hands with soap...

Hi All Will you please please explain this reaction to me.. Very Briefly?? The reaction of a metal eg. Fe with an oxidizing acid eg. conc sulphuric or dil or conc nitric... Fe + 4HNO3 -----> Fe(NO3)3 + 2H2O + NO 3Fe + 8H2SO4 ----conc hot-----> Fe(SO4)3 + 4SO2 + 8H2O Of course...

Homework Statement Beta = b/sqrt(mk) Explain how Beta can be interpreted as a ratio of time scales. What do the time scales measure? b: damping coefficient of spring (dimension: M/T) m: mass attach to spring (dimension: M) k: spring constant (dimension: M/T^2) The Attempt at a...

I know the integral to compute work done is (integral from a to b) F * dl where F and l are vectors, but I don't understand how I would use that in a problem. 1. Are a and b moments in time? 2. What is dl? Is that the same thing as l2-l1? So would it be (integral from a to b)...

Could someone explain the fourth dimension to me? I understand that it represents time. Could anyone thoroughly explain the concept? Thank you.

I have read a section but I don’t know their explanation , so please explain for me Thank you

Omega here is frequency. I used lambda = c/f. Why is it (2*pi*c)/omega and not c/f or c/omega? http://i111.photobucket.com/albums/n149/camarolt4z28/2010-10-04203213.jpg?t=1286245112 http://i111.photobucket.com/albums/n149/camarolt4z28/2010-10-04203118.jpg?t=1286245065

2.45 and 2.55 i don't get the steps, on how they get to the final answers, can someone explain please. http://ea2.mccormick.northwestern.edu/homework/hw1-sol.pdf

Gravity has to be the most screwed up force in the universe and the most enigmatic. It pulls on a boulder and a feather to produce the same acceleration. How screwed up is that? It is even more improbable as a moon always showing the same face to the planet it orbits. There is an infinate (or...

Homework Statement 1)a student saves his pocket money with the intention to buy an encyclopedia set costing RM1200.If he saves RM50 in the bank each month and the bank pays him an interest of ½ % per month , how many months has he got to saves before he can afford to buy the encyclopedia...

I know Earnshaws Theory basically states that it is impossible to levitate a charged object using static electric field. But can someone explain it in simple lamens language what exactly going on on an atomic level and how it ties in with Gauss's law? I look forward to hearing your replies

Please explain these question to me ... Homework Statement 1)A system of m equations over F2 in n unknowns has exactly 2n−m solutions. • A. True • B. False answer: false 2)How many roots x \in F2 does the polynomial x2+x+1 have? answer:0 3)Which of the following is a cube root...

Can someone please explain the picture attached below ? It has been taken from a lab where the supervisor actually failed to tell what is the remote sensing bulb doing attached to a condenser. I would like to know that why is it there and is the wire that is sticking out a capillary tube? If not...

Hey could someone explain to me this problem because i tried every single variation of the rules i learned in class, v = delta d/ delta t a= delta v/ delta t ect.. and i kept getting the wrong answer. A parachustist jumps from an airplane and freely falls y=53.2 m before opening his...

I read Stephen Hawking new book and did a little research on M-theory. Apparently in the 11th dimension there are different brains that crash into each other. 2 of these brains crashing supposedly rendered our big bang, and explains why stuff came out in blobs (not homogeneous). But how...

The Bernoullis Equation for an Incompressible Inviscid flow (say water) is as follows: p + (1/2).ρV^2 + ρgh = constant where, In words, static pressure + dynamic pressure + pressure energy due to height = constant It gives the Energy...

I did more than one course of classical electromagnetism in college. Recently, however, after reading "How Relativity Connects Electric and Magnetic Fields" (http://galileo.phys.virginia.edu/classes/252/rel_el_mag.html) I was astounded to realize how little I knew about it! In college (if I...

Hi all, this has been bugging me so maybe you can help me out. In the front window of my house, there is a dent in the glass that looks somewhat similar to this: http://www.flickr.com/photos/guerra/2557095422/" However, there is not hole in the glass. But the shape of the dent is...

In this circuit, please tell me how they got the 4 ohms and the 12 ohms in parrallel when they look like they are in series Please help me i am so desperate for an answer!

A person who weighs 200 lbs is falling through the sky while attached to a parachute. The equation of the downward velocity as a function of time for this is: dv/dt = g - (k/m)v Where g is the acceleration due to gravity, m the person's mass, and k is a constant depending on the physical...

Homework Statement A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 48.0mph , and the distance between them is 60.0m . After t1 = 5.00s , the motorcycle starts to accelerate...

Homework Statement I solved the problem and it matches the answer at the end of the book. Please explain why am I right? Why these two answers are correct? THank you Homework Equations The Attempt at a Solution

please can somebody explain the maths of E=MC squared thank you

I'm relativly new to quantum ohysics and have only read a few books, please can people explain some of the equations and the maths of quantum physics I can understand matrices and diracsc equations but please and somebody explain the maths of probability and other matters thx

Thanks in advance, mainly I just need some examples.

Hi.. Can someone explain when will upthrust change? cos i come across books saying that upthrust will not change when two objects of different density but same material are placed in the same fluid. I also come across that upthrust will not change when same objects are being transferred from...

I know that pulsars are Neutron stars that emit their energy through their poles, bit why do they emit it through their poles, and not their sides? And Quasars, I though that all mater that falls into a black hole never escapes, so how do we see the...''stuff'' leaving it?

Hi, I'm reading the SU(N) chapter in Jones' Group theory book. In SU(3) we have these 3 component spinors which transform as \psi^{'}_{a}=U_{a}^{..b}\psi_{b} and we have upper spinors defined by \psi^{a}=\epsilon^{abc}\phi_{[bc]} Now if consider building up higher-dimensional reps, by taking...

Homework Statement 5.10. Definition. A permutation of a finite set S is a bijection from S to itself. The word form of a permutation of [n] is the list obtained by writing the image of i in position i. We write n!, read as "n factorial", to mean n*(n-1)*(n-2)* ... *2*1. Homework...

Is the physics concept of tires kinematics or work/energy? Please explain why.?

I am having trouble understanding how (2x - x2)1/2 becomes 2 cos θ. Thanks

Hi friends is there anything that can explain the basic concept of IGBT inverter for ac motor drives..? Help me please... Hery

I think I understand the basics of the Big Bang but after trying to explain it to someone else, I've discovered that there are many details lacking in my knowledge. So I have come here in the hopes of alleviating my ignorance... I understand that in the very early universe, all the energy in...

Requirements for LR model -- please explain. In a recent, and ongoing, thread it was asked what are the requirements that an LR model of entanglement must meet. The following response was given by DrChinese. I still don't understand what he's talking about, so if DrC, or anyone else, would...

this is the formula for calculating core loss http://power.thayer.dartmouth.edu/pictures/function.jpg alpha, beta and k are constants that have to do with the material of the core. what are f and B, and what exactly does Pcore mean

I observed something interesting yesterday. At first, I couldn't explain it, but I figured it out after a few minutes, and I figured it might be interesting enough a problem to pose here. Yesterday, on my way to work (at about 7 in the morning) I picked up a pint of milk from UDF and drank it...

Allright, looking at at a bunch of string theories and using math to explain, it really looks like nonsense. Calculus is easy math to learn because it means something, eg. explaining and altering functions to make sense fundamentally. What I don't understand, is how people use math to model...

I understand Fourier Series fairly well and how to use them to approximate functions (I even wrote a C program to do it) but Transforms are really confusing. If I was to take the value of each Fourier coefficient and plot it on the y-axis against the angular frequency on x-axis (obv. there...

I've always wanted to understand the Theory of General Relativity but I've never found anyone to properly explain it to me. I was hoping that someone here could explain the principles to me in fine detail. I find the sheet of rubber with masses bending it to be an irritatingly unsatisfying...

Hello Guys, It would be really great if anyone can explain me what does mode of vibration exactly mean?? What does 1st,2nd ,3rd and 4th mode of vibration at 3Hz, 15Hz ,20 Hz and 40 Hz mean to the system.? Please check my knowledge on order of vibration too.. Order of vibration:-If a...