Distributed Definition and 210 Threads

Here is the question: Here is a link to the question: Help With A Statistics Problem! 10 Points!? - Yahoo! Answers I have posted a link there to this topic so that the OP may find my response.

Homework Statement I'm having some difficulty deriving the equation for a concentration of CO2 as a function of length and time. Ultimately I end up with an equation that includes the summation of two error function terms that appear to have incorrect signs. Given: A cylinder of...

Faraday says that a variation of magnetic flux generates an induced emf distributed by the material, which creates eddy currents. I want to know and understand what this "distributed" means. Do we have a constant potential difference between every 2 points of the object? (is this possible?)

Hello, and sorry for my English, as I am Norwegian. I have a statics problem which I can not understand. I've taken a pic from my book: The problem asks me to find the largest bending stress, σb, in the incisions 1 and 2. I have the solution in front of me, I just don't understand...

According to my book(mechanics of materials) the definition for concentrated load is when the area of contact of one body is small in comparison to the total area of the other body. So, small area in contact with big area equals concentrated load, but was watching an example on you tube that...

Hi PF, I have a device (with a microcontroller) which generates random numbers. when I analyzed those numbers using Matlab software I found that it is following a uniform distribution. How can I mathematically (any algorithm?) convert this random output to a gaussian one. Also I would...

Homework Statement Determine the forces of reaction.Homework Equations SUM of Y forces=0 SUM OF FORCES ABOUT POINT B = 0 The Attempt at a Solution My attempt is in the link, I scanned the diagram along with my work. Thanks for the feedback, appreciated. http://imgur.com/i3cB2 <----- Link

Homework Statement A point is uniformly distributed within the disk of radius 1. That is, its density is f(x,y) = C For 0 ≤ x2 + y2 ≤ 1 Find the probability that its distance from the origin is less than x, 0 ≤ x ≤ 1. [Note] My book says that the answer is supposed to be x2. 2. The attempt...

Hello, I am designing a wireless energy transfer system and would like a formula to calculate the distributed capacitance in a circular coil of N turns. Any kind of assistance is really appreciated.

This is not a homework problem but is rather something I'm curious about. I apologize if the answer is very simple, but I am having trouble coming up with an absolute and strict proof. * X is a discrete random variable that is symmetrically distributed about 0. Hence, E(X) = 0 * Why is E(X^3) =...

If you were to take a panoramic view of the sky, would the amount of electromagnetic radiation and matter/dark matter be relatively evenly distributed? Or is their a section/ sections in the sky that appear to be significantly more densely populated?

I need to create a system using heterogeneous database. I must use at least 4 different database. My choice would be MySQL, MS SQL Server, Oracle and PostgreSQL since these are among the most popular and matured database or if you have any database that is more suitable please tell me...

Mentor's note (not V50's, by the way): this thread was split from the following thread in Academic Guidance: https://www.physicsforums.com/showthread.php?t=609418 ----------------------------------------------------------------------------------------- This is the same argument as "Dressed...

1) (1 pt) The extract of a plant native to Taiwan has been tested as a possible treatment for Leukemia. One of the chemical compounds produced from the plant was analyzed for a particular collagen. The collagen amount was found to be normally distributed with μ=71 and σ= 8.5 grams per mililiter...

I was looking to a video about cumulative distribution function () and he show the following function: \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | 1/4, 0 \leq x \leq1 \\ f(x) =<(x^3)/5, 1 \leq x \leq 2 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |0, otherwise. At minute 8:45, he presents the cumulative...

I attended a lecture on DP yesterday, and learned some new things that I thought I'd share. If anyone has something to add on this topic, then please post. DR is when you install a generator at its point of use, like perhaps a 20 MW unit at a hospital or hotel. Payback is often as short...

Homework Statement An image of the assigned problem is here: http://imgur.com/aYkaM Homework Equations The formula for being exponential, gamma, and probably Bayes's Law. They'd take a while to type out, and presumably anyone who can help me with this already knows the formulas or...

Is there a way to get energy density from watts, with the resultant energy density not involving time, as watts do? Thanks, Jake

Homework Statement I have a bumper and I am trying to determine whether or not the rectangular tubing I am using to build it is strong enough to withstand a given load (rear end collision). The horizontal member is 4x3x.1875 tubing (4" base, 3" high, 95" long). Two 3x3x.1975 tubes are used as...

Conditional probability & "r balls randomly distributed in n cells" Homework Statement I'm posting this in hope that someone can give me a correct interpretation of the following problem (problem V.8 of Feller's Introduction to probability theory and its applications VOL I): 8. Seven balls...

I hope I wrote that correctly but I'm trying to find the joint. I heard it was impossible from someone. X = A/R A~BIN(n1, p1) R~BIN(n2, p2) I know I shouldn't be using the Jacobian method for Discrete distributions but I have to do it anyway. Anyone know?

Hi. Any ideas how to generate in any software R, Matlab etc normally distributed random numbers by one condition so they will be integers like 1, 2,3...and not decimal values. I tried to round up the generated decimal values but in my guess normality is doubted after that. Regards

So in the case of a spherical conductor, if we have charge distributed over it the electric field inside will ALWAYS be zero. Even when we place a charge near the sphere the field inside is zero right? And if we have a spherical insulator and we uniformly distribute the charge, the electric...

Hi I am testing that data are normally distributed by using chi-square test. I get a very high chi coefficient about 173. This is very strange because data fits at 3sigma test and median mode are equal so I am almost sure that is normal distribution. What I am doing wrong? Which test do you...

Homework Statement Lets say we have some data which we using the method of the least squares regression can express a linear regression model. I would like to know if this data generelly will be normal-distributed if it can be expressed by a linear regession model? and if so any way to...

Homework Statement A Normally distributed random variable with mean μ has a probability density function given by _ρ_...*...((-ρ2(x-μ)2)/2δ) √2∏δ|...e^ Homework Equations Its standard deviation is given by: A)ρ2/δ B)δ/ρ C)√δ|/ρ D)ρ/√δ| E)√δ|/2ρ The Attempt at a Solution...

Hi guys, I need to find the moment generating function for X ~ N (0,1) and then also the MGF for X2 . I know how to do the first part but I'm unsure for X2. do i use the identity that if Y = aX then MY(t) = E(eY(t)) = E(e(t)aX) or do i just square 2pi-1/2e x2/2 and then solve as...

Hi there, Parallel distributed loads are throwing me off a little at the moment. Is the resultant worked out the same way as for those with distributed loads perpendicular to a beam?? Picture included. Thanks in advance

Hi all, I am currently doing my Final Year Project on the topic of Optimal Placement of Suicide Bomber Detectors. Given 2 dependent bomb detectors, I am trying to prove that the probability of detection in the intersected area will be larger than the individually covered areas, by working...

hi there, I'm getting very very confused about distributed loads. I am trying to figure out the resultant force of a distributed load on a beam. The function I've been given for q(x) is a polynomial (below x=0). I have figured out the resultant for my function q(x)=x2-2x-4. I believe...

Hi all. Do we have a boundary (for classification) as to when a load can be called a point load or a distributed load? Thanks.

Registered events X in time interval t are distributed linearly n = n0 + bt. Find probability density function, then t = 10, n0 = 5 and b =2. Find average amount of registered events per day and Mean squared error. Find the probability to register an event per 5th and 6th days. What is the...

Homework Statement The top-selling Red and Voss tire is rated 60000 miles, which means nothing. In fact, the distance the tires can run until wear-out is a normally distributed random variable with a mean of 70000 miles and a standard deviation of 5000 miles. A: What is the probability that...

1. A 200N ladder is being carried by two men. The ladder is 12m; one man standing at the end, and the other 2m from the other end. Find the forces exerted by each man, 2. Moment of force = Force * Perpendicular distance from force 3. Man at end; 6*200 Other man 2m from other end...

Homework Statement Xi ~ U(80,120) find the E[X1+X2+...+Xn]=? Homework Equations The Attempt at a Solution Why can't I do this?: E[X1+X2+...+Xn]=n*E[X1] and just find the expected value? Is that because the distribution changes as we increase the number of elements of...

Homework Statement Hello If my data errors are normally distributed, is this the same as the data being normally distributed? I mean, by "normally distributed data errors" is meant that with 68% confidence the data lies within the true value?

Hi all, I'm considering a problem of a bunch of particles (say electrons) arriving on a plate. If the plate is orthogonal to the direction of motion of the particles their distribution (on the plate) is a gaussian distribution centered in a point (x,y) of the plate with standard deviation...

Hi Guys, I'm having real difficulty trying to understand shear force and bending moment diagrams - both cantilever beams and supported ones like below. I've given it my best shot to solve the reactions at the points and would greatly appreciate any help on how to form the diagram and the...

Homework Statement what is the difference between a distributed load with arrows pointing up like the once i have attached and just the standard distributed load where the arrow is pointing down. Does it mean the force is acting up the beam instead of down?the value given is -30kN/m. does that...

I have a set of data points {xi,yi} where each yi is a Gamma distributed variable where both the shape k and scale \theta depend on i. I then fit the data points with a power law model y=a(x)b. I would like to know the probability distributions for the fit parameters a and b. Is...

Hi, Suppose X_1, X_2,\cdots be an independent and identically distributed sequence of exponentially distributed random variables with parameter 1. Now Let N_n:=\#\{1\leq k\leq n:X_k\geq \log(n)\} I was told that N_n\xrightarrow{\mathcal{D}}Y where Y\sim Poisson(1). Could anyone give...

Homework Statement Show that for identically distributed, but not necessarily independent random variables with positive pairwise correlation ρ, the variance of their average is ρσ^2 + (1-ρ)σ^2/B. ρ - pairwise corellation σ^2 - variance of each variable B - number of samples...

According to M-Theory there are 11 dimensions including time. 10 of these dimensions are spatial, so objects can move and therefore have velocity? Correct? According to Einstein's General Relativity whenever an object is not in motion in the three spatial dimensions, velocity is conserved...

Hi All I'd like to know how I could calculate the work done by a distributed force on a string. Let's say the force at a point x at a time t is given by F(x,t). Now the instantaneous amplitude of the string is given by y(x,t), say I think that the work done by the force in...

Homework Statement check out: so this is for a bridge project right and that picture is simply a basic design just enough to get the jist to answer my question. what I am wondering is, if 20kg's was applied to the very centre of that loading plate - is it fair to say that each of the long...

Having a hard time with failure theories. Beam length 20 feet, 6"h x 4"w. sigma yield is 40 ksi. How to calculate the maximum distributed load the beam could carry using von Mises and Tresca failure theories. I have my shear and moment diagrams drawn and know they are right. I found that...

Homework Statement The random variables X1 and X2 are independent and identically distributed with common density fX(x) = e-x for x>0. Determine the distribution function for the random variable Y given by Y = X1 + X2. Homework Equations Not sure. Question is from Ch4 of the book, and...

Hello everyone, I have been tirelessly searching the net trying to find out how to calculate the distributed capacitance of a multi-layer bifilar coil. Just wondering if anyone here can point me in the right direction?

Why is dark matter distributed in a web rather than falling into clumps ? Under the action of gravity normal matter falls into galaxies, stars, planets etc. How is it that DM doesn't do the same but instead is in web form ?

Charge Q is distributed uniformly over a thin rod... Homework Statement Charge Q is distributed uniformly over a thin rod of lying along the x-axis between points (a,0) and (b,0) as shown. Please answer each of the following questions. a) What is the linear charge density on the...