Value Definition and 1000 Threads

What is the value of optical effective electron mass for tin metal (white tin)? What is the value of mean free path for electron of tin metal? At least give me some websites or papers where I can find it?

In the calculation of R=σ(e+e-→hadrons)/σ(e+e-→μ+μ-) from BaBar experimental data at a center of mass energy of √s≈10 GeV i obtain R=5. Theoretically I should get a value of R=10/3. I know it has something to do with the resonances of ϒ mesons shown in the plot attached, but I don't know how to...

In your opinion which company makes the best quality car considering the value for money? Which company uses the best products inside the cars? In my opinion good cars are Audi and Mercedes-Benz.

Hello all Currently struggle with a question from one of my assignments concerning poisons ratio . The notes given to me are vague and before i start trundling through the internet i was wondering if anyone could explain it ?

Hi. So I'm trying to use Laplace transforms in inverting a particular s-function via the convolution formula. I ended up with this terrifying-looking thing: So distributing, I ended up with: Evaluating the second integral poses no problem for me (although I think the integration will...

[Mod Note: Thread moved from Classical Physics, hence no formatting template] So today we performed an experiment to measure the Earth's magnetic field in three dimensions. For one of the dimensions we got 6.6x10^-5 i We were wondering if an imaginary magnetic field was possible and what it...

I know that Q value of a reaction is the difference between total initial mass-energy and total final mass-energy of all the products. Then shouldn't be this also the maximum kinetic energy and hence endpoint energy of an electron in beta decay. But what I have read endpoint energy ##E_0 = Q +...

1. The problem statement Consider a particle of mass m under the action of the one-dimensional harmonic oscillator potential. The Hamiltonian is given by H = \frac{p^2}{2m} + \frac{m \omega ^2 x^2}{2} Knowing that the ground state of the particle at a certain instant is described by the wave...

Hello, I hope to find some help. I have equation: and I need to find the value of parameter A at which the homoclinic bifurcation occurs. I know, that in this case A=-0.34, but I solution, how to find it. Can you help me, what numerical method I should use to find A? Thank you very much.

We have already seen topics on this forums discussing Physics degree as education and not job training, and that some physics graduates do get jobs but not necessarily as physicists, and that physics majors need to take a selection of practical courses to become marketable; and that internships...

Explain why there are no real numbers that satisfy the equation $$|x^2 + 4x| = - 12$$ How is this done algebraically?

Use the algebraic definition of absolute value to rewrite the expression below in a form that does not contain absolute value.

Use the algebraic definition of absolute value to rewrite the expression below in a form that does not contain absolute value.

Use the algebraic definition of absolute value to rewrite the expression below in a form that does not contain absolute value.

Homework Statement [/B] A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25°C, where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to...

Hi, I am interested in simulating the vacuum field equations, but solving a full boundary value problem rather than the initial value problem. i.e. I might have boundary conditions in all spatial and temporal extents/extremes, rather than just an initial 3D surface. Does anyone know any free...

Hi, everyone. Can someone guide me in finding the value of x in this equation? I have left calculus for a very long time and I came across this question and wanted to try but I have forgotten a lot of things. f(x)=5+2x and g(x)=2^x Find the possible value of x such that f'g(x)=3/2

Homework Statement So I have an equilateral triangle of side(s) = 3x10^-2 m Im trying to find the value of the distance from a point directly in the middle of the triangle, to the middle of one side. Homework EquationsThe Attempt at a Solution What I wanted to do was, cut the triangle in...

1) If g(x) = \frac{kx-p}{2} , g(7) = 8 , g(5) = 5 then find the value of x and g(x) . 2 )Show that f : N \implies N and f(x) = x+1 is onto function .

$\text{$32$}$ $\text{Newmarket Industries currently has $2,000$ shares of common stock outstanding. }$ $\text{The Firm has assets of $\$200,000$ and total liabilities including preferred stock of $\$75.000$.}$ $\text{Calculate the book value per share of Newmarket common stock}$...

If Eψ = Hψ, then why is expected energy ∫ψ*Hψ dx? It makes more sense if I see the ψ on the right side of H as the ψ in ∫Q(ψ*ψ) dx, where Q is some quantity we want to measure the expectation of. But if true, then since H is defined as (h2/2m) (d2/dx) + V, then what does it mean to calculate...

Homework Statement I am in a lab course studying Brownian motion. I have gathered data for for movement in two dimensions. I currently have a fairly large data set for ∆x and ∆y and have taken the mean and standard deviation of each. The lab asks what is the probability that these two sets of...

Hello all, I have posted on Physics Forums a few times in the past, but mostly for help with my old physics classes and not anything in the real world. Part of my work involves radiography, but it is generally done in a field environment where we just shut down large sections of land to safely...

Did not find any "place" for this question, but hopefully someone will be able to give me some help with this. corporate tax: Tc= 25% return on debt: rD=4% return on assets = rA= 10% Debt as amount of total value: D/V = 0.6 Equity as amount of total value = E/V = 0.4 A perptual cashflow before...

In 6 years, Mattos Oil Refining Company wants to pay off a $50,000 debt in one lump sum amount. They must set up an account to accumulate the necessary funds to pay off their debt. If the payments are made every 6 months and the fund earns 9.6% compounded semiannually, what is the amount of each...

Homework Statement We are given that a spaceship converts mass directly to light (emitted backwards) in order to accelerate. If an energy mc^2 has been converted to light ( from the Earth's reference frame) then what is the final speed of the ship (w.r.t. Earth) if the ship's rest mass is M and...

Let $a, b, c$ be non-negative real numbers satisfying $a + b + c = 5$. Find the maximal value of $a^4b+b^4c+c^4a$.

Folks - I'm asking a lot of questions lately (hopefully useful not just for me). By chance, reading about quantum states, I referenced Wikipedia (dubious I know), and came across the following phrase (with a citation, that I will check): "Even in quantum theory, however, for every observable...

Homework Statement B + A + T = 17 C + A + T = 25 C + O + A + T = 29 What is the value of B + O + A + T?2. The attempt at a solution O = 4 but how to find the rest?

Hello everyone. I stumbled across an article in the social sciences that had a correlation coefficient of r=0.93. Being from a maths background and knowing nothing about things like social sciences, psychology, etc., is this r-value in these types of fields considered fairly strong, strong...

Homework Statement Homework Equations I know that there are two eigenstates of the operator C: |B> = (1 0) as a column vector with eigenvalue 1 |R> = (0 1) also a column vector with eigenvalue -1 The Attempt at a Solution My work is shown here: If anyone could point me in the right...

Homework Statement [/B] 1. Using the Schematic of a 555 in astable mode from the Wikipedia entry on '555 Timer IC," resistor R1 = 8 kOhms and capacitor C = 3 micro-Farads. Determine the value of R2 so that the output duty cycle is D = 0.7. Note that D is not expressed as a percentage here for...

Imagine a particle in an equally weighted superposition of being located in three distant regions P, Q, and R, and imagine you stand in region P with a measuring device. The probability of finding the particle there is 1/3. Now imagine a large number N of particles prepared in that same state...

The problem is the following : I have some measured data's obtained when measuring a physical process. Let's call these : yE,L where E and L are 2 physical parameters of the experiment (an energy and a length). I also know that : $$\frac{y_{E,L}}{\sum_{k=1} ^{k=100} {\epsilon_{E,L} (k * v) *...

Homework Statement A and X: 6x1 vectors A = [-0.39; -3.99; 1.01; 0.57; -0.70; -2.81]B: 6x6 symmetrical matrix B = [1.1 -0.2 0.19 -1.03 0.69 -0.47 -0.2 0.17 -0.25 0.43 -0.06 -0.05 0.19 -0.25 0.88 -0.62 -0.21 0.29 -1.03 0.43 -0.62 1.59 -0.3 0.04 0.69 -0.06 -0.21 -0.3 0.97 -0.62 -0.47...

I apologize for the simplicity of the question (NOT homework). This is a statistical question (not necessarily a quantum mechanical one). If I have an initial probability function with an associated expected value and then a second probability function is superimposed on the initial...

Homework Statement Rewrite |x| < 1 and |x| > 1 by eliminating the absolute value sign Homework Equations |x| < 1 = -1 < x < 1 |x| > 1 = ? The Attempt at a Solution I know that |x| < 1 can be rewritten as -1 < x < 1 but I'm not sure about |x| > 1. Am I right to assume that |x| > 1 = -1 > x > 1?

$\displaystyle \int_{-1}^{1} \int_{-2}^{3}(1-|x|) \,dy\,dx$ ok i was ? about the abs

-3|x+5| + 1 = 7|x+5| + 8 Solution: -3|x+5| – 7|x+5| = 7 -10 |x+5| = 7 |x+5| = -7/10 x+5 = ±(-7/10) x = ±(-7/10) – 5 x₁ = -7/10 – 5 x₁ = -57/10 x₂ = 7/10 – 5 x₂ = 2/10 x₂ = 1/5 Correct?

I'm reading Velleman's book titled "How to Prove it" and I'm very confused when I'm reading about conditional statements. I understand that there exists some issue with the conditional connective and I accept that because that's the cost of espousing a truth-functional view. I came here to ask...

Homework Statement Hi, I did an experiment where I launched a soccer ball into projectile motion with my hand and took a video the situation. I uploaded it into the Tracker software to analyze it. The tracker software gave me a x-t graph, a y-t graph, and a y-x graph. From the y-t graph...

I am reading Manfred Stoll's Book: "Introduction to Real Analysis" ... and am currently focused on Chapteer 4: Limits and Continuity ... I need some help with an inequality involving absolute values in Example 4.1.2 (a) ... Example 4.1.2 (a) ... reads as follows: In the above text we read ...

I am reading Manfred Stoll's Book: "Introduction to Real Analysis" ... and am currently focused on Chapteer 4: Limits and Continuity ... I need some help with an inequality involving absolute values in Example 4.1.2 (a) ... Example 4.1.2 (a) ... reads as follows:In the above text we read ...

Homework Statement If ##P(x)\propto e^{x^2/2\sigma^2}##, show that the average ##\langle x^2\rangle = \sigma^2##. Homework Equations ##\langle x\rangle = \frac {\int xP(x) \, dx} {\int P(x) \, dx}## The Attempt at a Solution ##I = \int x^2e^{x^2/2\sigma^2} \, dx = \int (-\sigma^2x)(\frac...

Homework Statement Prove that A(X(ωk)2)≥A(X(ωk))2 if and only if X(ωk) has the same value for every k such that pk>0 for every category which actually occurs in the population Homework Equations A(X)=1/N∑nkX(ωk)=∑pkX(ωk) The Attempt at a Solution A[(X-A(X)2)]=A(X2)-A(X)2 and i believe the...

Homework Statement ## y''+\lambda y = 0 ; y(0) = 0, y(\pi)-y'(\pi) = 0## Homework EquationsThe Attempt at a Solution So, we have to test when lambda is equal to, less than and greater than 0. Let ## \lambda = 0## thus, the ODE becomes ## y'' = 0 ## which implies solutions of the form ## y(t) =...

If $x_1,x_2,...,x_{2017} \in\Bbb{R}_+$ and $\frac{1}{1+x_1}+\frac{1}{1+x_2}+...+\frac{1}{1+x_{2017}} = 1$ - then find the minimal possible value of the expression: \[\prod_{i=1}^{2017}x_i\]

Homework Statement Find the eigenvalues and eigenfunctions of the following boundary-value problem. ## y''+\lambda y = 0 ; y(0) = 0, y'(L) = 0 ## Homework EquationsThe Attempt at a Solution So, we have to test when lambda is equal to, less than and greater than 0. Let ## \lambda = 0## thus...

Homework Statement Homework EquationsThe Attempt at a Solution [/B] I don't understand how can current in ammeter be zero .Why is 2V battery not sending current in the right loop ?