Standard Definition and 1000 Threads

The covariant derivative in standard model is given byDμ = ∂μ + igs Gaμ La + ig Wbμ Tb + ig'BμYwhere Gaμ are the eight gluon fields, Wbμ the three weak interaction bosons and Bμ the single hypercharge boson. The La's are SU(3)C generators (the 3×3 Gell-Mann matrices ½ λa for triplets, 0 for...

Homework Statement A supplier converts the weights on the cement packages she sends out from Ounces to kilograms (1kg = 35.27 oz). How does this affect the standard deviation of the weights? Homework EquationsThe Attempt at a Solution [/B] My ans is the standard deviation remain constant ...

Homework Statement There are 15 numbers on a list, and the mean is 25. The smallest number on the list is changed from 12.9 to 1.29. a. Is it possible to determine by how much the mean changes? If so, by how much does it change? b. Is it possible to determine the value of the mean...

Homework Statement Let ##T:ℝ^3→ℝ^2## be the linear transformation defined by ##\begin{bmatrix} x_1 \\ x_2 \\ x_3 \end{bmatrix}\mapsto \begin{bmatrix} x_1 + x_2 + x_3\\ 0 \end{bmatrix}##. i. Find the standard matrix for ##T##. Homework EquationsThe Attempt at a Solution For this problem I was...

I did a PF search to try to see if this was discussed before, and didn't find what I was wanting to ask about (I could have missed it). :smile: I'm writing a Rubik's Cube game C/C# program for fun (starting with a console app and working up through various GUI options). I'd like to use a...

I am curious as to what the Standard Enthalpy of formation of Graphene is. I've noticed several highly technical papers on this subject but I got lost in the abstruse math and terminology. I am interested in the Standard Enthapies o both single layer and multi-layer graphene. I will be happy to...

I was given the averages (AVG) and the corresponding standard deviation (SD) of sets of data. I have no copy of the raw data for each data point that were used to calculate the AVG and SD. I performed further data treatment on the data. I want to ask what is the relationship between the...

I have a friend who argues that her car creates enough downforce to cause other cars to veer towards it as they pass. I can understand cars behind it being affected, but I can't imagine 4 door car creating a force similar to that felt while driving alongside a semi truck. For what it's worth...

I made a few paper airplanes. I noticed that the common paper airplane (shown below) https://i.ytimg.com/vi/v29M7Oa1l-A/hqdefault.jpg flies much further/better than paper planes that look like standard 747s. Any know why ? I expected 747 like plane to be very efficient at generating the lift...

Determine the equation of the circle that passes through the point (-4, 1) and its center is the midpoint of the line segment joining the centers of the two circles given below: x^2 + y^2 -6x - 4y + 12 = 0 and x^2 + y^2 - 14x + 47 = 0. Write the equation in standard form. 1. Does the...

Roughly speaking General Relativity is summarized with one equation but 15 or so equations are packed within it. Sorry if that's wrong, but I'm not an expert or anything. (If I could get an answer to that questions I would appreciate it to). I saw once a physicist show me a finite list of how...

Here is the Wikipedia page on electrode potentials. Here's how I'm reading it, which makes no sense: If a singly ionized atom of strontium donates an electron to the hydrogen in the standard hydrogen electrode, this will emit 4.101 eV of heat (395.68 kJ/mol). If cesium is used, there will be...

I'm trying to write a computer program which generates a random list of numbers but the random numbers form a bell curve, that is, there is a mean and a standard deviation from that mean. I'm not interested in some function that gets the job done, rather I'm trying to understand how do you...

Homework Statement For the five data 0, 7, 8, 10, and 10 find the standard deviation. Homework Equations https://forum.allaboutcircuits.com/threads/how-to-find-the-standard-deviation.138607/ I know the formula: Z = (X-Mew)/Sigma Sigma = Standard Deviation Mew = Mean = 7 X= score? Z= number...

Could someone guide me on the approach I need in resolving this question. I have seen some online examples of the same question, but what is required in this is different. I'll very much appreciate your support. Problem: For boys, the average number of absences in the first grade is 15 with a...

Okay, my topic doesn't really ask a question but it is surprising to me that the old criteria of 273.15K and 760 torr are still being reported as the standard and very few websites have the "new" criteria of 750.06 torr. Are scientists, webmasters, etc. usually this slow at adopting changes...

Homework Statement A company allows a maximum failure rate of 1 out of 250,000 parts. To insure this quality goal, failed parts must be how many standard deviations from the mean? Use Excel to solve. Homework Equations z= (X-μ)/σ The Attempt at a Solution Hi! So I'm assuming that this is a...

Homework Statement Let T: ℝ² → P² a linear transformation with usual operations such as T [1 1] = 1 - 2x and T [3 -1]= x+2x² Find T [-7 9] and T [a b] **Though I'm writing them here as 1x 2 row vectors , all T's are actually 2x1 column vectors (I didn't see a way to give them proper...

Homework Statement Convert the nitrate standard of 50 ppm to its nitrogen content Homework Equations Since NO3 contains one nitrogen, molar mass 14.01, in a total molar mass of 14.01 + (3 *16.00) = 62.01, the maximum concentration permitted expressed as nitrate ion itself is (62.01/14.01) *10=...

Dear guys can somebody explain, what is actually the following terms, used in fatigue analysis: 1. Mean stress correction factor 2. Plate thickness correction factor 3. Redundancy factor Thanks guys. you are the best...

hi I'm an astronomy student and i was studying the standard accretion disk model and I've got some questions related to it.! why do we consider the accretion disk to be stationary in standard accretion disk model? and what are the limitations of standard disk model? and i just read somewhere...

What are the constraints (if there are any) placed on time by the different theories in the standard model and what are their potential implications?

What are the electrical properties of standard lubrication oil (Engine oil)? Where to find? Please give the sources. I have tried my best on the internet.

I'm interested in finding out what the coefficient of friction would be for a few different materials such as:Copper on aluminum Copper on graphite graphite on aluminum I'm not sure if it matters if the order is reversed such as Aluminum on copper vs copper on aluminum.. also I've seen that...

Hello, I was wondering if anyone knows what the Standard electric potential of a razor blade might be? I read from a website this is a composition of a razor blade, I think they all have somewhat similar compositions, notably the presence of chromium. From...

I have 2 signals: signal1: https://www.dropbox.com/s/zr04pff9skeh8cn/TX.dat?dl=0 signal2: https://www.dropbox.com/s/h436a915dd99hln/RX1.dat?dl=0 signal2 represents for 20 measurements, each measurement combines with signal1 to get time delay estimation using xcorr. So, I will have 20 delays...

Hi all So I took graduate level courses of QFT, Quantum Gauge theories and a course on standard model of particle physics. I struggled a lot but got decent grades, so why does it all still look greek to me? It's becoming very frustrating to read sentences like "the theory is invariant under an...

Homework Statement you are given the standard form z = 3 - 3i Homework EquationsThe Attempt at a Solution so to convert this to polar form, i know that ##r = 3√2## but how do i find theta here? There are so many mixed answers it seems online that I can't tell... i know that ##(3,-3)## is in...

All particles get their mass from the higgs field. But how? According to the standard model what is "mass" and how do particles get it?

Hey everyone! I'm learning about some statistics and its past office hours with my teacher but I'm stuck on this problem.. I came up with 2.14% as the probabillity\final answer.. Could you guys give me your 10 cents on this? Thanks again!

I know that for SU(2), weak interaction, in the standard model the right handed leptons are singlets, (and right handed neutrinos don't exist). For right handed quarks are they singlets or doublets in the standard model. So is it (u d)R or is it just u(R) and d(R)

Hello, I'm seriously considering switching degrees to Physics, however I'm not sure whether I should be taking mathematical physics or standard physics (my School has both as separate programs). Which one would you say has better prospects later on? I am planning on getting a Ph.D in this...

I am computing limit of detection of zinc of an electrolyte. Using standard additions method, I have obtained positive x intercepts for 6/8 samples all very close to zero. Positive x-intercepts imply final concentration values to be negative. if x-intercept taken to be zero, the concentration...

Ok, according to my in depth research, wiki, the filament of standard incandescent light bulb will reach a temperature of roughly 2500 K. According to Stefan-Boltzmann, the power radiated from an object at temperature T (K) is given by P= A ε σ T^4 . Suppose the filament has a radius of 1mm...

I would like to consider the interaction terms in the Standard Model which allow the following decay process: The only interaction terms in the Standard Model which allow this decay process are contained in the charged current interactions: $$\mathcal{L}_{cc} =...

Hi Maybe my math/stat is very poor. I'm having trouble manipulating the standard deviation. Here's the thing. I have radar mounted on a car. For each detection, the radar returns these variables. - relative distance between the object/host vehicle in forward direction (in vehicle body-fixed...

I have a question regarding when to go for standard deviation σ or confidence interval ci. I am not sure of how to interpret ci. It seems to give me an option to choose the level of confidence, but I don't see why the the ci is divided by the root of the number of samples. Any pointers would be...

Just found this new book on amazon. Looks interesting. I purchased. https://www.amazon.com/dp/0691167591/?tag=pfamazon01-20 The TOC, Preface, and intro could be found here http://press.princeton.edu/titles/11050.html I wish they included a sample chapter as well (the book in not cheap), but I...

Homework Statement Determine whether the following subsets are open in the standard topology: a) ##(0,1)## b) ##[0,1)## c) ##(0,\infty)## d) ##\{x \in (0,1) : \forall n \in \mathbb{Z}^{+}## ##, x \not= \frac{1}{n}\} ## Homework EquationsThe Attempt at a Solution a) ##(0,1)## is open because...

Nothing like sending a doc to a client only to have them see a bunch of gobbledygook. I am using OpenOffice Writer, my client seems to be using some form of MS Word. In addition to .odt, Open Office will save in various flavours of Word: MS97/2000/XP (.doc) MS95 (.doc) Word 6.0 (.doc) (I...

Homework Statement [/B] Suppose a quadratic equation in 3 variables is put into a standard form represents a hyperboloid of one sheet. This hyperboloid has the property that: • the cross section through z= 0 is a circle of radius 1; • the cross section through x= 1 is the two straight lines...

In the Standard Model, for any particle, I have only found properties related to electromagnetic and gravitational (in fact mass does not necessarily mean it is a property related to gravity, but to emergy)forces like charge and mass. Why there isn't anything about the other two interactions...

Hi all, I learn some statistics some times ago. It has been while but I still remember some characteristics and property of the normal distribution. One of them is the standard deviation could be used to estimated the probability of finding the entity around the mean in the range ##[-n\sigma...

So when they said that to produce water vapor at standard state it releases -241 KJ/mol and liquid water -284 KJ/mol You can't create water vapor at standard temperature but I assume they used Hess' law Anyway, my question is when you change from water to vapor you need 44KJ/mol So that would...

I am trying to calculate the unit vector and standard deviation of the signal. I hope everyone can give me ideas. Here is my scenario: I have 2 rx channels: - f is channel 1 with the length 1x256 complex, then FFT. - g is channel 2 with the length 1x256 complex, then FFT. - from f and g, I can...

Hi all, Given that usually the most recent subject taught in a standard undergraduate curriculum is quantum mechanics, which was developed in the first half of the twentieth century, when did it become a standard part of the curriculum for undergraduates?

https://www.sciencedaily.com/releases/2016/12/161215080856.htm Can anyone provide the origin of this article.

I want to know of any standard method for identifying (and possibly quantifying) the species contained in a solid mixture sample. Thanks in advance!

Homework Statement In this experiment we will create a standard stock solution from lyphochek serum. The concentration of proteins in serum Lyphochek is 6,8 g / dl. Pipette 1.36 mL Lyphochek serum in a 25 mL volumetric flask and dilute with physiological water. Calculate the standard stock...

In the early days, the meter was not defined in terms of the speed of light and thus, having a defined meter and a defined second, measuring the speed of light gave an uncertainty of 1 m/s. Then the meter was defined in terms of the speed of light and this had the effect of giving the speed of...