Standard Definition and 1000 Threads

Hi guys, I need to find some textbooks which describe basic electronics. More precisely, I would like to learn 1) the components of a circuit (e.g. capacitor, diode, transistor) 2) how do these components work 3) The uses of these components 4) The standard appratus in a laboratory...

I am comparing two RMS error time-series and I would like to generate error bars on the RMS results. I think the RMS error is a standard deviation of an assumed zero mean process, and I have the gut feeling that this should be the standard deviation of the sample standard deviation. Is that...

1. An airline's flights have a mean arrival time of 5.8 min late with standard deviation of 2.1 min. What would be the appropriate x - scale for a histogram? 2. http://www.mathsrevision.net/gcse/sdeviation2.gif 3. I tried to do this problem, but I couldn't think of anyway to find...

Homework Statement A health physicist is testing a new detector and places it near a weak radioactive sample. In five separate 10-second intervals, the detector counts the following numbers of radioactive emissions: 16, 21, 13, 12, 15. a) Find the mean and standard deviation (SD) of...

Is the Standard Model of physics more aligned with Bohm's or Bohr's interpretations? And if more aligned with Bohm, then why is the Copenhagen model so highly regarded and not Bohm's?

Homework Statement Find the decomposition of the standard two-dimensional rotation representation of the cyclic group Cn by rotations into irreducible representations The Attempt at a Solution Ok i did this directly, finding complementary 1-dimensional G-invariant subspaces. but...

Homework Statement 1) A random sample of 26 students who are enrolled in College A was taken and their SAT scores were recorded. The sample mean is 548 and the sample standard deviation is s=57. Assume population is normally distributed. a) Find a 98% confdience interval for the standard...

Homework Statement Please help! i just need to see one step by step solution of how to solve this problem and then I can figure the rest out. When .560g of Na (s) reacts with excess F2(g) to form NaF(s), 13.8 kj of heat is evolved at standard state conditions. What is the standard enthalpy...

How does M theory force gravity as a necessity when the standard model couldn't fit in gravity?

(My previous thread on Bohm Interpretation quickly became 4 pages of mostly unrelated discussion. So I'm restarting here with more precise questions.) Okay, I've read some references on the Bohm Interpretation and I am still confused. As one paper mentioned, some extensions have stochastic...

I have a question can someone help me? If I want to determine the relates acute angle associated with each of the following standard pposition angles : 12/7 pi what is the answer and can someone show me as a drawing? thanks

When did beyond the standard model become an acceptable topic, and what has it added to our knowledge?

Homework Statement Write the equation in standard form for the parabola with an axis of symmetry y=0 and focus(-5,0). Homework Equations I think ax^2+bx+c. Also maybe x = -b/2a. But I don't know how to apply these. The Attempt at a Solution I know that focus and vertex lie on...

Are there any statistics on PHD doctorants whose thesis was on beyond the standard model, I mean how many percentage of them got to keep working in this field after they got their PHD?

1. The Standard model is an SU(3)xSU(2)xU(1) symmetric theory. To me this means that if you choose any 3 members of the groups and act on the Lagrangian, it is invariant. However, not all terms in the Lagrangian have something for a group member to act on, for example terms that don't involve...

At this point, I am rather confused about the concept of DE, and even why it is called DE since it does not seem to fit into what the concept of energy is. but my question is where/how does DE fit into the standard model? thanks.

Has anyone got a link to manufacturers catalogues or websites (anything online?) where I can find standard pipe shaft sizes?

I'm given a complex function in the exponential form: 2.5j e^(-j40*pi) Transforming this into the standard Cartesian form is pretty straight forward, but the extra j multiplying the 2.5 is kind of throwing me off. I don't know if I did it right, but this is what I did: 2.5j...

Homework Statement Data set in X with mean xbar = 100 and standard deviation Sx = 10 Find ybar and Sy for 2(Yi-5)/10 + 7 Homework Equations The Attempt at a Solution All the problems I have seen are in the form yi = axi + b in which case the mean ybar = a(xbar) + b and...

the curve points are: a) (25, 43) b) (28, 46) c) (32, 47) d) (35, 45) would i use y=mx+b i think that's a straight line

Homework Statement The resistances of 50 resistors are measured and the results recorded are as follows: Resistance x Frequency 1.) 5 x 17, 2.) 5.5 x 12, 3.) 6 x 10, 4.) 6.5 x 6, 5.) 7 x 5) Calculate standard deviation of the measurements Homework Equations The...

Homework Statement Convert to standard form ODE system y0 = f(t, y): t^2y'' + sin(y') + 2y − 1 = 0 the goal is to reduce the equation above to be a first order ode. Homework Equations The Attempt at a Solution I tried to introduced a new variable but the sin(y') seems tricky.

There are two things I don't understand here: Firstly, why in the standard deviation expression we use the Q operator instead of the Q value itself? Writting Q seemed more natural and then in the next expression I would just stick the corresponding operator. Which would lead to the same result...

Hi guys, Where can i find the most up to date (accurate) values of the standard model coupling strengths at the mass of the Z boson? Thanks Karnten07

Hi guys, Where can i find the most up to date (accurate) values of the standard model coupling strengths at the mass of the Z boson? Thanks Karnten07

Are the factorials a part of the standard definition of the wedge product? Is there an overwhelming majority or does the definition tend to vary from author to author? (As many other things do.) What I am referring to is: given two one-forms \sigma and \omega does everyone pretty much use...

Ok, here's the problem. I am evaluating multiple crossbows to predict the changes caused by various arrow weights. The original arrow mass and velocities are available. I input the two formula's: KE = 1/2MV^2 and MO = MV and solve for each, and then use those results with new arrow weights to...

I don't claim to be an expert of any kind, and most of these "problems" I see are probably just due to my own pre/misconceptions, but nonetheless: 1) As we get closer and closer to the Big Bang event, the universe is supposed to get hotter and denser until some sort of "infinity" where the...

I have a couple of questions about the standard model: 1.) I read somewhere that the standard model describes 3 closely related Yang-Mills systems, but i thought yang-mills systems were non-abelian whereas U(1) is abelian. So is the statement false or have i misunderstood? 2.)Why do i see...

hello can anyone explain what the difference is between RMSE and standard deviation. I am using RMSE in multivariate analysis but is it just the standard dev. why another name?

What is the formula for standard deviation?

Hey guys, Just a question which has been puzzling me for some time. I am told that means of samples of a population can be normally distributed with mean of \mu and with standard deviation of \sigma/\sqrt{}n Can someone please explain to me how the standard deviation is derived or is it...

Hi I know that our world is quite unstable and minor changes in these parameters could make the existence of life impossible. However, I am interested in what exactly is going to happen if we start to increase/decrease any of 30 parameters. It is interesting how well-tuned these parameters...

Homework Statement The scores on an exam are normally distributed, with a mean of 77 and a standard deviation of 5. What percent of the scores are greater than 87? Homework Equations The Attempt at a Solution I don't understand what it is exactly that I have to do to get the...

Homework Statement Due to the expense involved, car crash tests often use small samples. When 5 BMW cars are crashed under standard conditions, the repair costs (in dollars) are as shown in accompanying list. Use 0.05 significance level to test the claim that the mean for all BMW cars is...

Neutrinos are elementary particles that have the ability to pass through any matter. Billions of them pass through our bodies every second. Billions of them pass through the Earth and exit on the other side unaffected. They can pass through stars and travel to the other side of the universe...

Hi, Is it true that the standard gravitational parameter of an object (G*M) is more accurately known than the the gravitational constant (G)? If so, why? Any references would be much appreciated. Thanks, San

Homework Statement A dumpling manufacturer selects random sample of 28 dumplings and find that the mean and sample standard deviation are 101 g and 2.5 g respectively. The production standard of dumplings is to have a 100g. Based on the sample, can manufacture conclude, at 5% level of...

Where can someone find the entire standard model?

Hello, The standard deviation is calculated as: http://www.mathsrevision.net/gcse/sdeviation2.gif Now the problem I have is that how you calculate the standard deviation (more accurately?) over both samplesvif you have two samples of different size, n1 and n2, in which the level of the...

A standard 52 deck contains 4 different suits with 13 cards in each suit A player is allowed to draw 2 cards at a time. If a pair of matching in suit is drawn the player receives 1 point, if a pair matching in number is drawn, the plaeyer receives 2 points, otherwise the player gets no points...

Homework Statement Quartz, SiO2(s), does not spontaneously decompose to silicon and oxygen at 25C in the reaction: SiO2(s) -> Si(s) + O2(g) even though the standard entropy change of the reaction is large and positive (delta S = +182.02 J K-1). Explain. -------------------------...

If Z1,Z2...Zn are standard normal random variable that are identically and independently distrubuted, then how can one prove that squaring and summing them will produce a Chi- squared random variable with n degrees of freedom. Any help on this will be greatly appreciated. I am new to this...

Homework Statement If there are 4 children in a family, find the probability of getting exactly 3 girls. Find the mean, variance, and standard deviation. Use two different methods(binomial distribution method and general probability distribution method). Homework Equations Binomial...

"Normalizing" standard deviation between two data sets I have a baseline set of data collected which has a standard deviation of X, and then I collected another set of the data under a different condition (different temperature), and this has a different standard deviation Y. How do I cancel...

Every now and then one reads that the standard model does not work for energies above 1 or 2 TeV. Can anybody explain where this statement comes from? As far as I understand, there are no deviations of the standard model form experiment. There is only the issue of Higgs mass being...

A certain vector has x and y components that are equal in magnitude. Which of the following is a possible angle for this vector in a standard x-y coordinate system? 30° 180° 90° 60° 45° Is this problem too simple or am i missing something? if the x and y components are equal in...

Hi guys. Im new at this site so please be nice to me =P. I've been working on some practice papers for my upcoming end of semester exams. Cant get these two questions out ><. Any help is greatly appreciated Thanks in advance jenny xoxo 1. A sample of 28 students measured their...

A proposed MDM goes beyond the standard model in a minimal way, so as to produce a candidate for dark matter. Here is story from Nature News: http://www.nature.com/news/2008/080902/full/455007a.html Here is a key excerpt: ==quote== ...It now seems that some physicists have taken...

Given the mean energy of a system in a heat bath is \bar{E} = - \frac{\partial ln(Z)}{\partial \beta} Where Z is the partition function and \beta = k_BT Why is the standard deviation of E defined by: (\Delta E)^2 = \frac{\partial^2 ln(Z)}{\partial \beta ^2} I can't seem...