Standard Definition and 1000 Threads

Hello; I apologise for any typing errors, as I am typing from a handheld device. However, there is something that I do not understand about the standard model. I have read that this equation is a 'lagrangian' but I do not know what this means or how to work with one. According to what I...

Homework Statement Hi, I was wondering what does a standard introductory, algebra-based Physics course cover first, rotational motion/torque or energy and conservation? This is the time period right after Newton's Laws. What usually comes next? Circular/Rotational Material or Energy? Thanks...

Homework Statement A sales contract between a manufacturer and a buyer requires 20 towels to be subjected to a water absorption test. If no more than 2 towels fails the test, the batch is accepted. If 2 or 3 towels fail the test, an additional 20 towels are tested. The batch is then accepted...

I'm having trouble deriving the amount of dimming expected of standard candles (eg. type 1a supernovae) as a result of dark energy. Without the presence of dark energy, the standard GR solution (matter-only, at critical density) is that the absolute bolometric brightness of a standard candle...

http://articles.latimes.com/2010/jul/07/science/la-sci-proton-20100708 Like the article says, if this experiment is true, the proton is 4% smaller than originally thought. If true, doesn't this mean we have to throw out everything we think we know about particle physics (standard model...

Let's say I monitors my local aquifer (Edwards) using well J-17 over the past 8 summers (not counting this summer). I found that the mean water level/day is 680 ft above sea level, with a standard deviation of 30. Assuming a normal distribution, how do I find the probability that the aquifer...

If one is contemplating a nuclear plant or production facility, these are just of the Review Plans and Standards one is required to meet. There is also 10 CFR 50 and the numerous Regulatory Guidelines (Reg Guides). http://www.nrc.gov/reading-rm/basic-ref/srp-review-standards.html Digging...

Homework Statement I have two sets of data, each with 30 distances and 30 results, I have the mean, median, mode, range etc, I have drawn histograms and cumulative frequency curves, got the IRQ for both sets of data. Now I need to compare the data using standard deviations and also find...

standard entropy of formation ?? Homework Statement the standard entropy of formation of magnesium is 32.7 J/mol k , That of oxygen gases 205.2 J/mol k at that magnesium oxide is 26.9 J/mol k . A) What is the entropic energy change when 25 grams of magnesium are burned inexcess...

what are the draw backs in using simple pendulum as a time standard?

What does this mean? Average? Sum?

I am trying to find out how many possible puzzles can be created out of the standard 9x9 grid. I was never very good at permutations and combinations, so I won't get very far here... All I can think of at the moment is that while there are 9^{81} ways to fill all the boxes with numbers from...

OK I was going to post this in homework, but it's not homework (left school a long time ago ;)) Anyway when I was at school I did not do stats I did mechanics instead (you had a choice). However all the people doing stats were always on about the the SD, which was a bit annoying cos I...

fuzzy logic can be emulated with "standard logic" if fuzzy logic can be emulated with "standard logic" then how can it be fundamentally different? shouldnt any newly proposed logic system, by definition, be impossible to model with another logic system? If you can emulate it then its not...

Hi, sometimes when I'm trying to work out the Fourier Transform of a signal, I get different answers depending on whether I use Fourier Transform properites (such as rect(t) will go to sinc(f) etc) or whether I use the FT integral. Here's an example where I'm not sure which 1 is the correct...

I have spent a while trying to get to grips with the building blocks used for constructing feynman diagrams, below is my attempt at a set of reactions, how am I doing so far? I don't think e^{+}e^{-}\rightarrow\mu^{+}\mu^{-} can happen since a gluon only interacts on particles with a...

I would like to understand the theory behind the standard deviation formula. The way it was explained to me, you have to subtract each value from the mean and square it to avoid the negatives canceling out the positives. After multiplying and dividing by the correct frequencies, we have to...

[b]1. A voltmeter is used to measure a known voltage of 100V. Forty percent of the readings are within 0.5V of true value. How do I figure out the standard deviation of the voltmeter, and how do I figure out the probability of an error of 0.75V? [b]2. I am trying to figure this problem...

Homework Statement A Sample of gas 250 mL at 37 C and 730 torr . What volume would gas occupy at standard conditions ? Homework Equations pv = nRT V2 = T2P1V1 ------- T1P2 The Attempt at a Solution Sample Gas V = 250 mL ( 0.250 L ) P = 730 torr ( .960...

Homework Statement Homework Equations Not completely sure, but I believe equation is: Cx = bCs/mVx cx = concentration of sample b= y-intercept cs= concentration of standard m=slope Vx=volume of sample The Attempt at a Solution I plotted the values on a graph with Absorbance...

Homework Statement Hi, I have this question that is bothering me. If I have a large set of data, each with its unique error uncertainty. How do I get the average error uncertainty from all the data points? Do I simply use the equation below: (∆ Z) ² = (∆A)² + (∆B)² And divide...

It is my understanding that the world of physics is split by a fast chasm into experimental and theoretical physics. The first time I told my father I wanted to be a physicist, he asked me “experimental or theoretical physics?” I thought for a second and responded “both!” He went on to explain...

Homework Statement This is an example in my book with omitted steps. Suppose the reaction time X of a randomnly selected individual to a certain stimulus has a standard gamma distribution with alpha=2. When X is continuous P(2<=X<=5) = F(5;2)-F(3;2) = .960-.801 = .159 Homework...

A big part of the theory of the standard model is that the major forces are mediated by the exchanging of elementary particles. So hypothetically, if we discovered some material that blocked the photon, for example, does this mean an object wrapped in this material would be unaffected by the...

How the Berkeley edition Calculus book by Stewart differs from the "standard" one? Hi, Since I'm going to do a self study of so-called Calculus II, I've made my research and decided to go with the course schedule from Berkeley Math 1B. Here are some of the schedules from the recent years...

Homework Statement Graph the following: 15(x+2)^2 + \frac{(y+3)^2}{4} = 4 Homework Equations \frac{(x-h)^2}{a^2}+\frac{(y-k)^2}{b^2}=1 The Attempt at a Solution I can't seem to get both coefficients to 1, since the right side is only 4. If I multiply the whole thing by 4, I can...

Homework Statement The standard enthalpy of formation for liquid water is -285.8 kJ / mole. Which of the following could be the standard enthalpy of formation for water vapor? A) -480.7 kJ / mole B) -285.8 kJ C) -241.8 kJ / mole D) +224.5 kJ / mole Homework Equations The...

How do we show that, given a matrix $A$, the sign of the determinant is positive or negative depending on the orientation of the rows of A, with respect to the standard orientation of $R^n$?

Homework Statement the question asks you to calculate the standard derivation for the mean distance of an electron from the nucleus. you are given the mean distance (<r>), and the probability density Homework Equations delta r = sqrt (<r^2> - <r>^2) <r> = 3.a/2 The Attempt at a...

Homework Statement Sally, Bob and Charlie each measure the period of the same pendulum to determine the acceleration of gravity, g. The lab instructions say that you should determine the period by timing the time of 100 swings (complete cycles) of the pendulum. Sally is the first to do the...

Hey, so I am teaching myself the C language to get a head start for a class I have to take later and am a little bit confused about something. I understand that if you call a function from within your int main, the variables you pass are actually copies of the originals and when the program...

Homework Statement Students measured an object 5 times, and got the results 11,25 cm, 11,20 cm, 11,22 cm, 11,18 cm i 11,25 cm. The height of this object is: A. h = (11,22 ± 0,03) cm B. h = (11,22 ± 0,04) cm C. h = (11,25 ± 0,07) cm D. h = (11,25 ± 0,03) cm Homework Equations Standard...

Why is it that change in enthalpy (h=e + pv) depends upon pressure as they say, we should measure at standard pressure, while pv=nrt so no matter da presure nrt is the same the product p by change in volume is constant so accordin 2 me we should specify only da temperature change...

How to compare the topology on R generated by the subbasis S={[x,y)|x,y are rational}U{(x,y]|x,y rational} to the discrete topology on R?

We've been watching this development taking shape ever since the tentative Gambini Pullin papers about it in 2006. It represents a fundamentally new way to address the problem of interpreting Quantum Mechanics. One person who worked on this back in 2006, with Gambini and Pullin, used to post...

Homework Statement Homework Statement Hello everyone! I have been having trouble with cumulative frequency graphs in excel for some time now. I wonder how you make the "bell graph" or cumulative frequency graphs or standard deviation graphs in microsoft excel. I have excel for mac. I...

Homework Statement the problem states solve for n. nP4 = 8(nP4) Homework Equations no relevant equat. i can think of? The Attempt at a Solution my attempt at this was nP4 = 8(nP3) idk what i tried to do, but i tried to get it in standard form i guess: n!/ (n-4) = 8(n!)/(n-3) it...

Hello everyone, Can anyone please help me to find where I can purchase the DIN 2999 standard? Regards Huygen

"Higgsless" Standard model I realize we haven't been able to see the signal for a Higgs boson directly yet, but I have heard there is plenty of indirect evidence for the Higgs (in that it is needed in the model to match experimental results). My question is essentially: are all forms of this...

--- Found solution. Nvm.

In a lot of compilations of standard integrals (my Calculus book does this, Wikipedia does this), a lot of the integrals of trigonometric functions have an absolute value in their solution which seems out of place to me. For example, take the integral \int dx \cot{x}. My Calculus book says...

Hi, I have a question about standard errors in the context of this problem. Any help would be greatly appreciated: Suppose X is a discrete random variable with P(X=0) = 2y/3 P(X=1) = y/3 P(X=2) = 2(1-y)/3 P(X=3) = (1-y)/3 Where 0<=y<=1. The following 10 independent observations were...

Standard ML help! datatype problem I have to create a function about peano numbers defined as the following datatype: datatype 'a peano = P of ('a -> 'a) * 'a -> 'a I have to create a function about peano numbers defined as the following datatype: datatype 'a peano = P of ('a -> 'a) *...

Given an imaginary, mechanical chimpanzee that never wears out nor sleeps nor relents. Who is compelled to type constantly through eternity into an endless text file using a US standard keyboard... as fast as he can. That this monkey knows simply that he must hit only character keys and only one...

Homework Statement write the standard form of the equation x^2-4x+8y+12=0 find the focus Homework Equations The Attempt at a Solution i have it down to (x-2)^2=-8(y-8) i'm not sure if you have to multiply the -8 on the right side of the equations by 4 since the focus is 1/4a

By definition standard deviation has divisor 'N' . But in Microsoft Excel the "STDEV" function gives 'N-1' as divisor. This may not be major issue to many of the people. But the command "STDEV" makes many users feel that this is standard deviation, i.e. it has divisor 'N'. Misleading...is...

A little background on my situation: I was a business major for 3 years before I switched to ME. As such, I've completed my school's core curriculum and have some spare time now that I'm in the ME program, being able to take only 8 - 12 hours per semester if I stay within the curriculum. So...

A block rides on a piston that is moving vertically with simple harmonic motion. (a) If the SHM has period 1.0 s, at what amplitude of motion will the block and piston separate? (b) If the piston has an amplitude of 5.0 cm, what is the maximum frequency for which the block and piston will be in...

The problem is to find a closed form for the expectation (mu) and standard deviation (sigma) of the probability density function underneath (Maple notation): f(t) = a*exp(a*t)*BesselK(0, 2*sqrt(exp(a*t)))/BesselK(1, 2) I was able to find an expression for mu:: mu =...

I am looking for a decent book (probably a textbook) that covers the standard model in its entirety (not necessarily in its vast detail, though). I am a physics undergrad in my 4th year, so I'm looking for something that gets into specific math and theory, but obviously not something that would...