Errors Definition and 328 Threads

Hi just a quick question. :confused: What are systematic and random errors? Are systematic errors, ones where you use equipment which is not 100% accurate. For example using a ruler which is accurate to +/- 0.1mm? Are random errors ones where the experiment is done slightly different...

the following post probably isn't going to be so cohesive, bear with me anyway: I'm completing a report and need to combine several sets of results for the same experiment and combine their errors to give a best value - can't for the life of me remember the formulae, i know roughly what it is -...

I'm hoping that at least one of you have read/worked with this book and noticed that there are blatant errors in the solutions he gives to his problems. How am I supposed to check and see if I'm going about it correctly if I cannot verify my answer in the end? It's my only "text book" for the...

What do you guys think of this site? http://www.relativitychallenge.com/mistakes.htm" Is there anything to this?

I'm interested in learning foreign languages. I plan maybe to study japanese linquistics in college. I'm learning spanish and japanese, but more japanese for now. I signed up for a yahoo account on yahoo chat on video games, but I keep getting very strange errors and it won't let me type in...

Hello, how can large variation between sets of different Ph results be scientifically explained, i am investigating the effects of Ph on enzyme activity, there are small error bars in my results between ph1,2,3,4 &5 however there is larger error bars between ph-6,7,8,9 & 10. there's an...

This is my report on an experiment that I have done and I really needed the latex codes to generate the equations. I have done the other parts of the report on other PC. Do they seem to be ok? (the errors, like the max possible value and min possible value) no help is really needed, rather...

John Stachel is at Boston U. department of Physics and Center for Einstein Studies. His field is the Philosophy of Science, or maybe history/philosophy. The Stachel paper I'm proposing we scan for typos is Structure, Individuality and Quantum Gravity http://arxiv.org/gr-qc/0507078 I...

PCCP Hot paper: Theoretical breakthrough - analysis of the errors in explicitly correlated electronic structure theory

:rolleyes: I am havin a bit of trouble w/ a graf here... its about resonance waves in resonance tubes and i have a straight line graph when i plot the values of length of the wave vs. 1/frequency. the problem is, i don't no what this line/slope is meant to represent? and it doesn't run through...

What changes would have to be made to a cell so that when it divides the genes in the daughter cells are exactly the same,in the same order and number on the chromosomes, as they were in the parent cell?

Calucation of ERRORS - CHEM! hi I am doing one of those determining calcium hardness in swimming pool water here just stuck on a few bits 1) how do i convert concentration (mol/L) -> ppm ( parts per milliion) example i am given concentration of calcium = 8.595*10^-4 M how do i get parts...

hi guys assistance in this area would be great just see what i have written and comment on them please thanks! all. im thinking about the errors in titration from doing a typical acid-base titration to talk about in my experiment and these are the errors i came up with. First of all my...

Say I wanted to do a calculation with numbers that had an error attached...what would the error be on the final answer? For example, say I was trying to work out the distance v in relation to lenses etc. by this formula: \frac{1}{v}=\frac{1}{u}+\frac{1}{f} say u was 50cm plus or...

Hi, I am trying to determine the half lives of two radioisotopes in a neutron activated sample of copper. I have plotted the the ln(activity) vs. time and then used the linest function on excel to get a decay function for the longer half-life by assuming after a certain time, only the longer...

Hi guys..i always seem to forget how to calculate errors and end up confusing myself in a giant mess...so any help much appreciated. I have 24.98 +/- 1.05 = e/(nkT) And i need to work out n, i know all the other numbers (which are constants and have no errors). So firstly how do i...

I don't know if this more of a math question than a physics question, but here goes: Let's say I have an equation, let's say V=IR. Let's also say I know \sigma I and \sigma R, the possible errors in I and R, how can I calculate \sigma V, the error in voltage? Is there a way to generalize this...

Hi, We did a lab the other day involving the calculation of Ksp values. Objective of the lab was to calc the Ksp of CaSO4 by several methods and to determine which method would give the most consistent/accurate value for the solubility product constant. Heres what we did: A) 1. Filter...

Hi we're doing a project in class where we make roller coasters and we test them out by sending a marble down them. As a bonus question my teacher asked why there would be an error in the calculations we do (finding speed at different locations of the roller coaster) if we're using a...

propagation of errors? (lab "phenomenon" question) In our lab, we are measuring the acceleration due to gravity. We do this by dropping an object through a photogate, which records position vs. time data as the object falls. From this position vs. time data, the computer uses derivatives to...

Hi Arcsin width/length of a water droplet on any surface will give you the angle between the droplet trajectory before falling (assume straight line rather than parabola) and the surface upon which it fell. As this angle approaches 90degrees (water drop falling vertically on a horizontal...

What would you say is the most common error an anti-SR theory has? I find that it is almost ALWAYS someone synchronizing two events separated by distance for multiple frames. Examples would be the barn pole paradox, the train-through-tunnel paradox (front goes in: bomb armed, backs goes in...

I have a simple question regarding nullclines, as I'm having trouble determining the correct direction errors. For example, here's a system of equations: dx/dt = 2-x-y dy/dt=y-x^2 x-null is y= -x + 2 y-null is y= x^2 x-null is vertical, y-null goes horizontal. But when I...

Are percentage apparatus errors also systematic errors?

It turns out that I have been fighting just this problem with an older industrial computer [industrial automation stuff]. Due to my lack of familiarity with this particular processor, I couldn’t be sure if I had configuration problems or some other software induced problems. I just observed a...

Experiments can't prove something which is logically flawed. Einstein's invalid procedure in deriving his transformation equations besides (see http://www.physicsmyths.org.uk/lightspeed.htm), motion is always only relative, so each of two obervers moving relatively to each other can claim that...

I put up some ideas/theories on my web page and was wondering if people here could take a look at them. They're fairly far-fetched but I think people would find some of them interesting nonetheless. They're also fairly short so it shouldn't take much of your time. I wrote them for fun on my...

For some reason today seems to be the day for people making all sorts of factual errors. Maybe its the April 1st thing, I don't know. What bugs me though, is people who do not own up to their mistakes. When an error is made unintentionally, it is a mistake. When an error is made...