Mean Definition and 1000 Threads

I been searching

https://en.wikipedia.org/wiki/MOSFETLikewise, the "oxide" in the name can be a misnomer, as different dielectric materials are used with the aim of obtaining strong channels with smaller applied voltages. http://www.electronics-tutorials.ws/transistor/tran_7.html In the saturation or linear...

When we calculate fractional uncertainty , we get a percentage of the uncertainty but what does it mean? For example 5% .

I am using VASP and it recommended to use the experimental magnetic moment for MAGMOM tag. The problem is I can't find a standard table of magnetic moments. I see different values from different sources. E.g In Web Elements, the magnetic moment of Fe is 0.096 μ/μN. But in another source, it is...

How the Mean colour of visible spectrum is yellow? Shouldn't that be green according to acronym VIBGYOR?

Homework Statement Homework Equations V=IR The Attempt at a Solution My first guess is the quote in the title of this thread meant the a1 except now a1 * v3 instead of a1 in the below image, which we already have from a previous problem. I think my interpretation may be wrong I think...

Homework Statement Homework Equations V=IR P=I^2 R[/B]The Attempt at a Solution [/B] What does it mean physically and intuitively "power entering the source" ? That might be a start in getting me to understand why the answer is just negative the power dissipated in the resistance. What...

It seems like it should be possible to calculate the mean (usual average) from a 5-number summary of a set of numbers (min, first quartile or Q1, median, third quartile or Q3, and max). You should be able to calculate roughly what a percentile is, then by taking each discrete percentile and...

Homework Statement Let f: R -> R be a function such that \lim_{z\to 0^+} zf(z) \gt 0 Prove that there is no function g(x) such that g'(x) = f(x) for all x in R. Homework Equations Supposed to use the mean value theorem. If f(x) is continuous on [a,b] and differentiable on (a,b) then...

Homework Statement Consider a gaussian graph let 5 quares on y -axis represent 1units Homework Equations is it correct for me to say that the average value of the quantity on the y-axis is given by y_av = (y_min + y_max) / 2 where y_min is smallest value of y in the graph = 0 y_max is the...

Homework Statement A diet pill is given to 9 subjects over six weeks. The average difference in weight (follow up - baseline) is -2 pounds. What would the standard deviation have to be for the 95% T confidence interval to lie entirely below 0? ANSWER: Around 2.6 pounds or less Refer to the...

Homework Statement What is the mean free path of an N2 molecule in an ultra-high-vacuum chamber at a pressure of 10-10mbar? Homework Equations λ=1/(√2)nσ number density n, collision cross-section σ p=nkT pressure p, temperature T σ=πd2 d molecular diameter The Attempt at a Solution...

Homework Statement Derive an expression for the mean collision time in a gas where the collision cross-section is σ and the number density is n. The Attempt at a Solution I'm just using my book to do this, and I can't get past the first bit... It says Consider a particular molecule moving at...

Homework Statement If Y=X1+X2+...+XN prove that <Y>=<X1>+<X2>+...+<XN> Homework Equations <Y>=∫YP(Y)dY over all Y. The Attempt at a Solution I only seem to be able to show this if the Xi are independent, and I also think my proof may be very wrong. I basically have said that we can write the...

In NBA, Announcer says "foul to give" at the end of the game, please some one explain. when will "foul to give" will be used? i mean, at which quarter of the game? & also A team has 3 fouls left, can they foul B Team without getting penalty is meaning of "a foul to give"? can shooting fouls...

http://www.pluggakuten.se/wiki/images/3/3e/Prov221.JPG Solution

Go to 1:24 of this video: He recalls some integral he wrote at a young age: " ... times the sixty-fourth power of ... what?" and looks confused. At 1:44 Neil Degrasse Tyson says, "By the way, the answer to your little calculation is i." Can someone explain the historical reference to me...

Dear Friends! Is weighted mean greater than mean? Actually i need to prove (c-b)f(a)+(b-a)f(c)>(c-a)f(b) when when f is continuous and strictly increasing in [a,c],where a<b<c.

Homework Statement What exactly does it mean for a surface to span a contour/curve? For example, which surface(s) span the contour/curve defined by the equations x^2 + y^2 = 1 and z = y^2? Homework Equations N/A The Attempt at a Solution I'm not sure if I'm saying something nonsensical, but...

hy i have a problem...i want to calculate for example this: x = [1 2 3 4 5 6] meanx = 3.5 y = [ ... ] y = ... >>> calc: (xi - meanx )*(yi - meany) the mean is calculate the casio 991es + in static mode...but how to calculate this 1st part: (xi - meanx ) ? in MATLAB we did like this: (...

If I built up static in me and then touch a doorknob and get shocked, am I then sufficiently grounded to be able to touch electrical components? Or was it just that the extra electrons were discharged and I should still ground myself in another way before touching electrical components?

Hi Guy, My name is John Dolan and I am an Irish student studying Astronomy in the university of Groningen in the Netherlands. I have been interested in Physics and Astronomy since I was knee high to a grasshopper and I look forward to asking questions, finding out new ideas and new ways of...

http://www.iflscience.com/physics/physicists-develop-reversible-laser-tractor-beam-functional-over-long-distances In this article, they said they could control the particle's direction by changing the laser's polarization. Could someone explain this to me? I have to do a presentation on it...

http://web.phys.ntnu.no/~ingves/Teaching/TFY4240/Exam/Exam_tfy4240_Dec_2013.pdf solutions: http://web.phys.ntnu.no/~ingves/Teaching/TFY4240/Exam/Solution_tfy4240_Dec_2013.pdf In problem 3 a) I'm supposed to reform the integrand from ##\vec{J}(r',t_r)## to something like ##\vec{J}(r'|\omega)##...

It would be better with a clear example to understand

Scores on an examination are assumed to be normally distributed with a mean of 58 and a standard deviation of 18. (a) What is the probability that a person taking the examination scores higher than 72? (b) Suppose that students scoring in the top 10% of this distribution are to receive an A...

Hello, I've been reading astronomy books for some time now but after leaving things for a while I seem to forget rotation directions. For example, I know that the Earth spins in the anticlockwise direction. That is easy to see why. They say that motion of the Earth is eastwards. Because of the...

I am having trouble deciphering the opening gambit of an explanation of mean values of functions. It begins as follows: "Consider the part of the curve y = f(x) for values of x in the range a ≤ x ≤ b." A graph is shown with a curve cutting the x-axis at c with a shaded positive area bounded...

I'm not a physics person (just an interested layperson) and have read that quantum particles don't have any location until they are measured. First, is this true? And, if so, what does that mean? For example, if you don't know where a particle exists, then how can you even measure it? And...

If you write a=dv/dt Then you can write it as dv=a*dt And take the integral on both sides integral(dv)=integral(a*dt) My question is: What does dv=a*dt mean?? How do I interprete it? What does the individual term dt mean? And what does dv for it self mean? To me it seems like “dv” means...

I'm new to physics and I see "det" used in math a lot. What does it mean?

The loggamma distribution is defined by $$ g(x) = \frac{1}{ \Gamma ( α) θ^{ α} } \frac{(ln( x))^{ α - 1}}{x^{1+\frac{1}{θ}}} $$, for $$ 1 < x < ∞ $$ where α is a positive integer. I've been trying to find the mean and variance of this distribution. It's been somewhat frustrating because the...

Hello All, Pertaining to General Relativity, what do we mean when we tell a space is flat or space is curved? Is it that sum of the angles of a triangle = 180? Or is it something else. I was listening to a lecture of Prof.Susskind, when he takes a piece of paper, makes certain points on the...

I did the problem but none of my answers match up with the answer choices so I'm obviously doing it wrong. Can someone show me how to do these two problems. I have a test coming up and I am so behind For women aged 18-24, the systolic blood pressure (in hg mm) are normally distributed with a...

Homework Statement The components of a random vector ##\mathbf{X} = [X_1, X_2, \ldots, X_N]^{\intercal}## all have the same mean ##E_X[X]## and the same variance ##var(X)##. The "sample mean" random variable $$ \bar{X} = \frac{1}{N}\sum_{i = 1}^NX_i $$ is formed. If the ##X_i##'s are...

Homework Statement Hi, I am doing some basic X-ray analysis and trying to quantify the measurement uncertainty associated with my determined value for the K-α line of copper. I have obtained the x-ray spectrum from a copper target using a detector and multichannel analyzer (No. of pulses/pulse...

Homework Statement (We are to solve this with Monte Carlo programming. Based on the universe from Olber's paradox) Suppose you are in an infinitely large, infinitely old universe in which the average density of stars is n = 10^9 Mpc^−3 and the average stellar radius is equal to the Sun’s...

Could anyone explain what the following ratings mean on a transformer? 120kw load, 1000v/500v, 60Hz

While I am familiar with the derivation of the relationship between mean translational kinetic energy, ##<E_k>##, and temperature, ##T##, for an ideal gas (namely ##<E_k> = \frac{3}{2}k_B T##); I fail to see how we can establish such a relationship for solids, liquids, and even real gases. Could...

I'm studying electrostatics and magnetism right now in Physics II for Engineers. I'm doing ok with most of the concepts, doing well in class, etc. I'm missing (or at least not 100% sure) of a basic part of the concept here. I feel like I'm correct in assuming that an object with no charge is...

Hi guys, I'm getting ready for a stats exam and one of the questions looks like this If I'm not given a histogram, how can this be solved?

Hello, everyone. What do the blue and pink color the rust indicator shown mean? Let say, the mixture of potassium hexacyanoferrate(III) and phenolphthalein is the rust indicator. And we use to detect the rusting of an iron nail. And the result is: the tip, head region of the nail appear blue...

Homework Statement Determine the minimum mean square error for the joint PMF. You will need to evaluate ##E_{X, Y}[(Y - 14/11\cdot X - 1/11)^2]##. Homework EquationsThe Attempt at a Solution The answer is ##\frac{3}{22}##, but when I work it out, I get ##\frac{203}{484}##. From my values, I...

Need help with this exercise been stuck on it for a while i think i get the gist of what i am supposed to do but can't seem to get it to work i am definitely missing something. I set h(x)= x-2/3 - g(x) and tried using the mean value theorem on [a,b] and then tried finding the minimum value of...

The Squeeze Theorem states that if three functions f(x), g(x), and h(x) exist, and f(x) \leq g(x) \leq h(x), and if \lim_{x \rightarrow a} f(x) = L and \lim_{x \rightarrow a} h(x) = L, then \lim_{x \rightarrow a} g(x) must exist and its value must be L. Here is something I don't understand...

Sigh. A couple of days ago my first paper got rejected. The editors claimed that " the experts we consulted felt that the paper is not suitable for the journal". A few days later I wrote them back requesting them to elaborate on where my paper had failed to meet their expectations and that any...

This is problem 20b from chapter I 4.10 of Apostol's Calculus I. The geometric mean G of n positive real numbers x_1,\ldots, x_n is defined by the formula G=(x_1x_2\ldots x_n)^{1/n}. Let p and q be integers, q<0<p. From part (a) deduce that M_q<G<M_p when x_1,x_2,\ldots, x_n are not all...

Hello, I were wondering how to say the unit of the momentum by words, for example if the momentum equals 15 GeV/c , is it right to say: The momentum is 15 giga electron volts divided by the light velocity ? will this be clear for an audince, since ' c ' here can equals 1 at natural units ...

Hello! (Wave) In order to show that not every collection of objects is a set, we do the following: We will show that if we suppose that "everything is a set", we are lead to contradictions. If $V:=\{ x: x \notin x \}= \text{ the collection of all objects, that don't belong to themselves }$ ...

say you have <ψ|x|ψ⟩ or <0|F|k⟩ where F is an operator, what does this actually mean? I understand C|ψ⟩ would be the operator C acting on PSI and <ψ1|ψ2⟩ is the inner product of two wavefunctions but what would a third term inbetween them mean? thanks for any help