Error Definition and 998 Threads

I am running MCNP. It gives a error massage : fatal error description of cell 27 uses 1098 words. 1000 words max. I am not able to resolve this. If anybody can explain me about this error and how to correct it. regards

Homework Statement The problem is about calculating the error on the area of a rectangular field. What is known is that the sides of the rectangle are 120 m and 180 m, and they have been measured with a 10 m measuring tape. The tape has a sensitivity of 2 cm.Homework Equations Since the area...

Homework Statement I am trying to solve a system of 2 ordinary differential equations using matlab. However, I am not able to get numerical solutions from the code despite having keyed in all possible solutions. Homework Equations The equations I am given are: dx/dt=A(x/t)+By...

Homework Statement I have only repeated a measurement once, I cannot assume it is distributed as a Gaussian because there is so few data. How can I estimate its combined uncertainty? The Attempt at a Solution Total data: x1, x2 I calculated the individual uncertainties in x1 and x2 using error...

I felt upon a mistake I made but cannot understand. I consider the following rotation transformation inspired from special relativity : $$\left(\begin{array}{c} x'\\ict'\end{array}\right)=\left (\begin {array} {cc} cos(\theta) & -sin(\theta) \\ sin(\theta) & cos(\theta) \end...

Homework Statement Let t = f(g, h, A, Δm, Γ, r). For t = 2 s, the propagated error is σ = 0.02 s. Can the error of 1/t2 be simply determined using the known error in t = (2 ± 0.02) s, or must the variance formula (with all the partial derivatives and errors of each dependent variable) be...

Homework Statement Using Taylor series, Find a polynomial p(x) of minimal degree that will approximate F(x) throughout the given interval with an error of magnitude less than 10-4 F(x) = ∫0x sin(t^2)dt Homework Equations Rn = f(n+1)(z)|x-a|(n+1)/(n+1)![/B] The Attempt at a Solution I am...

I'm currently in first year engineering and I seem to be struggling with Physics, which is not unlikely uncommon. A simple problem I've come across is not doing correct error analysis when writing up lab reports. In my current lab, which is justifying the relationship of angular frequency...

I was reading an 1803 paper by Thomas Young (of double slit fame), "Experiments and Calculations relative to physical Optics". In it, he lists various dimensions of fringes of light and things. All without any error bars. It got me thinking, what's the history of error bars in scientific...

Hi I've collected few sets of data and obtained significant different linear regression (R^2) in 2 particular sets of data . Does that indicates the 2 sets of data is not validated which might due to data collection error? For example, 20 sets of data contain linear regression of 0.900+...

Homework Statement Above is my attempt of the answer and the problem q. The correct answer is -2V. In the solutions given to us, it has this line: I understand that V- is 0V due to the characterisitcs of an op-amp. But I don't understand where is the - V0 coming from. Any ideas...

Homework Statement y=1/(x^1/4). I'm given 5 x's and 5y's. I need to write Newton interpolating polynomial and find the error. Homework Equations Ln-1(x)=f(x1)+f(x1,x2)(x-x1)+... The Attempt at a Solution With the formula above I wrote the Newton interpolating polynomial but I can't find the...

If each individual poll has a margin of error, when you combine all the polls, why do they say poll of polls has no margin of error? Shouldn't the margin of error get multiplied when you combine many polls?

[Mentor's note: This thread was moved to the homework section from General Physics, so it doesn't use the template.] Going over a basic kinematics problem with the prompt stating vi=0, x=1000m and Δt=5 and vf and a need to be solved using average v and a. Calculated vf=200ms and a=40m/s/s. But...

Obviously ##\mathbb{R^2}## is convex, that is, any points ##a,b\in\mathbb{R^2}## can be connected with a line segment. In addition, ##f## is differentiable as a composition of two differentiable functions. Thus, the conditions of mean value theorem for vector functions are satisfied. By applying...

Homework Statement i suspect the possible error of 100cm/192cm = 1m /192 m is wrong , IMO , it should be 1m /1.92m , right ? Homework EquationsThe Attempt at a Solution

Homework Statement We measure the temperature with a thermometer and we get these results: 3.3 +- 0.1 ºC 3.5 +- 0.1 ºC 3.6 +- 0.1 ºC What is the temperature? Homework Equations Average = Sum of values/amount of measurementes The Attempt at a Solution Well, I calculate the average and I...

I figured that I would post this in case someone may know the answer. I have a small server at home that is using a self-signed certificate. Firefox used to give a warning about this and then let you accept the certificate. However, newer versions just block the site without being able to...

Hello everyone, I am in the process of designing a buck converter. This is the regulator I have chosen. http://www.aosmd.com/pdfs/datasheet/AOZ1242DI.pdf The input will be 13V output will be from 12 to 6 volts (will be adjusted via a thermistor on the FB voltage divider R2) Now, the issue...

Hi, I've just had my first lab in physics and I'm having a bit of trouble understanding how to determine the significant figures of my final answers and transforming them in scientific notation. For example: Homework Statement [/B] I had to measure three sides of a parallelepiped with a...

Homework Statement A common method for finding wavelength is to use diffraction grating. The relationship between wavelength λ and the angle of max intensity θ for first order interference is λ = d*sinθ where d is the spacing between lines on the grating, which is the inverse of the grating...

Hello everyone, I have a very simple question but for some reason, I couldn't find the exact answer to it on the internet. Let's say we have a formula y = k/x where k is constant and x and y are variables. Assume that I am given the absolute uncertainty in x how should I calculate the...

Hello! I have some concentrical spheres with many points inside. And I need to plot the total mass of points in each shell (so between 2 spheres) versus the radius of that shell (defined as (r1+r2)/2, where r1 and r2 are the radius of the 2 spheres forming the shell). I have 10 shells so my plot...

I am trying to scrape some website. And this the code i have import urllib2 from bs4 import BeautifulSoup from urllib import URLopener from urllib import FancyURLopener import traceback,sys headers = { 'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'...

Hello, I have a question about steady state error. how can we get to the C? I think it has to be Ea(G1+D)G2=C which gives(R-NH)(G1+D)G2 / (1+(G1+D)G2H)=C

Let say I have a random number generator with numbers in and include between +200 to -200. We know the average has to be zero if you sample infinite number of times. How about you are only allow to sample 30 times, what is the maximum error from ideal zero in 30 random sampling? Is there a...

Hey everyone, I just started, what is supposed to be a beginners course in MatLab, but I am the only one who has never used MatLab before! I'm stuck on the very first HW assignment (although I did manage to get to problem 6 out of 7) and was hoping someone could explain why I keep getting an...

Hi, I am having trouble doing a multiple linear regression with Minitab . Here is a screenshot of the error message I keep getting: https://www.physicsforums.com/attachments/105043

Homework Statement Section 11-2, Page 651, Example 3 Homework Equations y = sin^3t and dy = 3cos^2t sint dt. Shouldn't there be a Minus Sign there? The Attempt at a Solution Answer is correct. But isn't there a missing Minus Sign?

Hey guys, so I wanted to give Matlab a shot regarding programming standalone applications but I keep getting the same error whenever I use "deploytool" in the command prompt. The error message picture is attached to this message. According to the error message I must change my MATLAB current...

Homework Statement I have to shot 100(±5) to kill 50. how many shots I need to kill 1 bird? Homework EquationsThe Attempt at a Solution 100±5/50 = 2±0.1 this solution is so simple, I think it is not right - is it? :rolleyes:

Homework Statement We measure the period of oscillation of a simple pendulum .In successive measurements ,the readings turn out to be 2.63 s , 2.56s , 2.42s , 2.71s and 2.80s . What is the period of oscillation taking into account appropriate significant figures ? Homework EquationsThe...

Hey PFers. I recently did an install of Matlab R2015b on a x64 Windows 10 PC. It doesn't matter what I plot or how I plot it (e.g., plot(), scatter(),etc.), when I use the figure dropdown menu Insert→Legend I get the following error Error using assert Too many input arguments. Error in...

Homework Statement I'm trying to find da/a to calculate the relative possible error in the radial acceleration. The equation I have to derive from is a = 4π²n²rt ⁻² (it cannot be a = v²/r). I'm not really sure how to find da since it has 3 variables? Homework Equations a = 4π²n²rt ⁻² da/a =...

Hello, I have a set of N samples, each of which yields the measurable variables A and B. I am interested in computing the mean and standard error of the ratio A/B within the group. The catch is that I need to do background subtraction on both A and B, and the two different background values BGA...

error bounds for trapezoidal rule, midpoint rule, and Simpson's rule. can anyone please show me how to derive the formula?

Hi everyone. I am totally new to statistics so my question may or may not be simple! I know that for the data fitting we can do a chi squared test like: \begin{equation} \chi^2 = \Sigma \frac{(f_{data}-f_{model})^2}{(error_{data})^2}\end{equation} So I have been doing this for a while, but now...

I am currently creating a database of all the known cosmological objects, and need to know the percentage error in the following data: Diameter of the sun: 1.3914x108 metres Mass of sun: 1.989x1030 kilograms I have the orbital period of the sun to be: 2.75x107± 9.1% years

I have an error, denoted e(x,y) for example. It's not a norm and it isn't symmetric, that is to say: e(x,y)\neq e(y,x). My question is simply this: With such properties, is the choice of such a function a good one?

Homework Statement I have performed a chemistry experiment where I analyzed how the diluting of two reactants with the same volume and initial concentration impacts the percent yield of a precipitate product. Thus my IV was concentration and my DV was percent yield. My question is what is the...

Homework Statement In computing the average kinetic energy of a molecule obeying Maxwellian distribution one use the formula ½mc2 .Calculate the percentage error incurred in the calculation. The Attempt at a Solution Here c is the average velocity of a molecule obeying Maxwellian distribution...

Homework Statement In one of my revision guides, there is an experiment for calculating the acceleration of free fall using the electromagnet and trap door arrangement. The biggest error is in the measurement of the height over which the ball falls. The guide says: "You could reduce the error...

So my dad was using his dinosaur of a computer today and this error message comes up. I tried googling the code/address given, but I can only find a match for the code not the address. Any insight to this would be nice.

Hi, Just made a small thought experiment on the train, haven't really thought about it in depth. I was just wondering, if I created the above scenario (open circuit secondary and a voltmeter), would I get a voltage (assuming there is a difference in turns for primary and secondary)? Neglecting...

Hi there, I'm working on a problem right now that relates to least squares error estimate for polynomial fitting. I'm aware of techniques (iterative formulas) for finding the coefficients of a polynomial that minimizes the square error from a data set. So for example, for a data set that I...

Hi all, I am very confused about how one can find the upper bound for a Taylor series.. I know its general expression, which always tells me to find the (n+1)th derivative of a certain function and use the equation f(n+1)(c) (x-a)n+1/(n+1)! for c belongs to [a,x] However, there are...

Hello I found a bug in my code and can't figuring out the error. I tried debugging by showing the output of each variable step by step but I can't find my error. Here is what I have and what I want to do: I have a matrix A: 0000 0101 1010 1111 And I have a matrix B: 10000 21000 30100 41100...

Hi All Im hoping I am in the right area to ask this?!? Im looking for someones help. Is there a standard methodology or known equation for generating a random alpha numeric serial or incremental, which does not allow two characters to be used in sequence to each other which are near each other...

X = # of cars that pass in one hour E(X) = λ = n * p λ cars/1hour = 60min/hour * (λ/60) cars/min In this old video (5:09) on poisson process Sal asks: "What if more than one car passes in a minute?" "We call it a success if one car passes in one minute, but even if 5 cars pass, it counts as 1...

I'm a beginner with the study in data analysis in Physics. I'm trying to understand the meaning, in the field of experimental Physics, of the standard deviation ##\sigma## of a series of data. There is one fundamental thing about ##\sigma## that I read but I could not understand. >In a series...