Properties Definition and 1000 Threads

Hi, I'm pretty good in basic thermodynamics so I know how to make simple predictions of properties of substances like( h, g, cp, ecc...) but I always need some value to start with (e.g. entalpy of formation at 298K, perfect gas). I was wondering if there is a website with this kind of data for...

1. The problem statement, all variables, and given/known data I am given a distribution function f(x) that tells me the number of objects with a certain physical property x (such as having a certain mass or temperature) and I need to calculate the total number of objects, the average value of...

I am reading Bruce P. Palka's book: An Introduction to Complex Function Theory ... I am focused on Chapter 4: Complex Integration, Section 2.2 Properties of Contour Integrals ... I need help with some aspects of the proof of Lemma 2.1, part (vi), Section 2.2, Chapter 4 ... Lemma 2.1, Chapter...

So I understand that scientists have been able to slow light to extremely low speeds using Bose-Einstein Condensates and even without them (https://physics.aps.org/story/v3/st37) and if I understand this correctly they slow light the same way water or air does; atoms absorb the photons and...

Why we assume total air pressure (dry air +water vapour) to be constant during study of properties of moist air even when it is being heated or cooled how it is possible that pressure is constant , on what basis it is assumed? I think locally there must be variation in total pressure also due...

How can the power/amplitude of a particular RF harmonic be calculated? I would assume it is some well-defined fraction of the amplitude of the main frequency? Do RF harmonics from a square-wave drive appear only on the even, odd, or both, multiples of the base frequency? How do high-frequency...

Let S be the minimal uncountable set. That is, for every m in S, there are countable many n s.t. n<m. Let L = { S x [0,1) } \ ##(a_0,0)## where ##a_0## is the smallest element of S (S is well ordered so this element exists). Order L be dictionary order, and then give L the order topology. Show...

Homework Statement Two pans filled with water. Water in a 3.7cm deep pan is observed to boil at 98 degrees Celcius. At what temperature will the water in a 46.3cm deep pan boil? Homework Equations P=3.146T-211.87 (linear approximation) Water properties table: 95°C 84.609kPa .001060 vf 1.9808vg...

I recently was able to view a 193 foot building from 24 miles away. The base of the building is approximately 15 feet above sea level and my eye level was approximately 9 feet above sea level. I was viewing the building across a Lake. I could see a substantial amount of the building, which...

How can we work out all the properties of wave from differential equation? And what really does differential equation of wave implies?

Homework Statement The limit superior of a sequence ##(a_n)## is defined as ##\overline{\lim}_{n \to \infty} a_n = \lim_{n \to \infty} \sup \{a_k ~|~ k \ge n \}##. Letting ##L = \overline{\lim}_{n \to \infty} a_n##, I am asked to prove the following: (i) For each ##N## and for each ##\epsilon...

Hello! I'm measuring the second order correlation function g(2) of quasi-thermal light, generated by focusing a 633 nm laser onto a rotating sandpaper-like surface at 45 deg. Part of the dispersed light is collected into a fiber and split with a fiber beam splitter. A simple HBT setup. g(2) is...

Hello everybody, I am using an equation of state to calculate the thermodynamical properties of a material. I have a problem which is the ideal part of the equation. Actually, I cannot be sure that the ideal contribution in my equation is the really ideal contribution, so I decided to calculate...

Water molecule has different properties from either oxygen or hydrogen atom. My question is 'Are these properties of water molecules totally new or were these properties already lurking around in the oxygen and hydrogen atoms?' Thanks.

The title of this thread is the title to this Phys.org article posted today: https://phys.org/news/2017-08-physicists-complementary-properties-quantum-clones.html First, correct me if I'm wrong, but the problem is not that complementary states cannot be both measured, but that the there is a...

Homework Statement A 125g pear is immersed at the bottoming of a beaker of water which is filled with 500cm3 of water. Salt of mass 30g was then completely dissolved in the water before the pear begins to float (assume no change In Volume of the water ) given the density of pure water is 1 g...

How can some PC scammers change the properties of a pc and its device manager to sell it to a high price? How can show another PC's device manager as that of the another PC? Thank you.

Hey guys, Can anyone help me think of some relevant physical (8 or so) and chemical properties (5ish) required by flag poles. I was struggling to think of some but here are some of mine: Physical Flexibility Elasticity Melting point Strength? Electrical conductivity?? Chemical Stability UV...

I am reading Ethan D. Bloch's book: The Real Numbers and Real Analysis ... I am currently focused on Section 1.5: Constructing the Rational Numbers ... I need help with Exercise 1.5.9 (3) ...Exercise 1.5.9 reads as follows: We are at the point in Bloch's book where he has just...

Homework Statement I am reading Ethan D. Bloch's book: The Real Numbers and Real Analysis ... I am currently focused on Section 1.5: Constructing the Rational Numbers ... I need help with Exercise 1.5.9 (3) ...Exercise 1.5.9 reads as follows: Now ... we wish to prove that for ##r, s \in...

Find cos(z) and sin(z) if z is an angle in quadrant III (in standard position) and the terminal side of angle z is parallel to the line 3x+4y=12. I just want to make sure I'm thinking about this correctly: The definition of an angle in standard position is that the vertex is at (0,0) and the...

Homework Statement Although the basic properties of inequalities were stated in terms of the collection P of all positive numbers, and < was defined in terms of P, this procedure can be reversed. Suppose that P10-P12 are replaced by (P'10) For any numbers a and b one, and only one, of the...

$\tiny{7.t.27}$ $\textsf{Write an equation for a sinusoidal graph with the following properties:}\\$ $$A=-3, \textsf{Period}=\frac{2\pi}{3}, \textsf{Phase Shift}=-\frac{\pi}{4}$$ \begin{align*}\displaystyle A&=-3\\ T&=\frac{2\pi}{3}=\frac{2\pi}{\omega}\\ \omega&=3\\...

Where may I find a data about of density and specific heat of CuMn? I can't find any data about it.

I am reading Ethan D. Bloch's book: The Real Numbers and Real Analysis ... I am currently focused on Chapter 1: Construction of the Real Numbers ... I need help/clarification with an aspect of Theorem 1.2.9 (6) ... Theorem 1.2.9 reads as follows: In the above proof of (6) we read the...

I am reading Ethan D. Bloch's book: The Real Numbers and Real Analysis ... I am currently focused on Chapter 1: Construction of the Real Numbers ... I need help/clarification with an aspect of Theorem 1.2.9 (6) ... Theorem 1.2.9 reads as follows: In the above proof of (6) we read the...

Homework Statement Prove the following '()( − ) = −′() ∫-∞∞δ'(x)*f(x-a) = -f'(a) Homework Equations ∫-∞∞δ'(x-a)*f(x) = f(a) The Attempt at a Solution [/B] ∫-∞ ∞δ'(x)*f(x-a) = ∫δ(x)*f(x-a)dx-∫f'(x-a)*δ(x)dx = f(-a) - f'(-a) Went from 1st to second by integration by parts Used...

I was wondering what kind of properties the new particle detected from the LHC would have? For example is the particle charged? Could an electron orbit it and is it a stable enough particle to be able to participate in chemical interactions? What else is known?

Hi all, How does matter curve space (what's the mechanism)? Does this Curvature happen instantaneously or does it happen at light speed? Thanks in advance.

Homework Statement Prove that a 2x2 complex matrix ##A=\begin{bmatrix} a & b \\ c & d\end{bmatrix}## is positive if and only if (i) ##A=A*##. and (ii) ##a, d## and ##\left| A \right| = ad-bc## Homework Equations N/A The Attempt at a Solution I got stuck at the first part. if ##A## is positive...

hi，all. I want to calculate thermodynamic properties of refrigerant R410B. I get some data from www.eThermo.us Can anyone tell me if the accuracy of this website is OK? I use these data for my heat exchanger design. Thank you! Ning

Can anyone recommend a source to check fluid properties like surface tension, density, etc. Specifically, I'm interested in silicone oil DC-200. Thanks!

I have this fundamental question about stress and strain. If we apply same Force on two different objects of same geometry in the same configurations, will they experience the same stress? If yes, then does it imply that stress is independent of the internal material properties?

my textbook says that electrons have a basic characteristic of magnetism just like charge and mass. this magnetic property in some materials adds up to result in a permanent magnet and in some others nullifies each other. how does it really occur? moreover if electrons hav magnetic properties...

If I have a particle with: Momentum: p Spin: s Energy: E Position: x Time coordinate: t Charge: q And I preform a CPT transformation on said particle, what will these variables become? Can you show me mathematically? Also, could you show me how this effects the wavefunction/quantum state of...

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 am doing composite analysis in ansys acp. i am using nomex hneycomb as core sandwiched with 3k twill carbon fiber on each side. i am unable to understand properties that my manufacturer gave. these are lengthwise and widthwise but in ansys i have to enter properties in x y z direction. can...

first of all english is not my mother tongue sorry. I want to ask if you can help me with some of the properties of the levi-civita symbol. I am showing that $$\epsilon_{ijkl}\epsilon_{ijmn}=2!(\delta_{km}\delta_{ln}-\delta_{kn}\delta_{lm})$$ so i have this...

first of all english is not my mother tongue sorry. I want to ask if you can help me with some of the properties of the levi-civita symbol. I am showing that $$\epsilon_{ijkl}\epsilon_{ijmn}=2!(\delta_{km}\delta_{ln}-\delta_{kn}\delta_{lm})$$ so i have this...

The SM Higgs-boson is a CP-even state, as far as I know this is confirmed in the Higgs decay to di Z bosons, so why there are dozen of papers that propose to measure CP quantum number of the Higgs in tau tau final state?, what is the difference between CP in ZZ and tt of Higgs decay ?

The intrinsic charge parity of a species is the ##\eta_C## defined in the equation $$\mathcal C |\psi \rangle = \eta_C |\psi \rangle $$ which can take on values ##\pm 1##. Since the gluon carries a colour charge, it is not an eigenstate of the C (charge conjugation) operator. 1) Why do I...

How were they able to simplify the following? I understand the distributive property and how the convolution component of the delta dirac function worked but I do not understand how the second term convoluted becomes what it is. Thank you for your time

Hey there, my honours year thesis is on the design and analysis of a carbon fibre wheel for a Formula Student racecar. However, I am unable to obtain carbon fibre material properties to input into the Engineering Data section. I am required to specify the Youngs Modulus in the x, y and z...

Homework Statement We assume from ODE theory that given a smooth A: I → gl(n;R) there exists a unique smooth solution F : I → gl(n;R), defined on the same interval I on which A is defined, of the initial value problem F' = FA and F(t0) = F0 ∈ gl(n;R) given.(i) Show that two solutions Fi : I →...

Homework Statement Let γ : I → R3 be an arclength parametrized curve whose image lies in the 2-sphere S2 , i.e. ||γ(t)||2 = 1 for all t ∈ I. Consider the “moving basis” {T, γ × T, γ} where T = γ'. (i) Writing the moving basis as a 3 × 3 matrix F := (T, γ × T, γ) (where we think of T and etc...

Hi All, What are the main differences between statistical and dynamics properties in physics? Could you please explain the difference for problems in both classical and quantum mechanics. For instance, path integral molecular dynamics is supposed to give statistical properties of a quantum...

Are the physical properties of a particle spread out through the wave function in bohmian mechanics? This is from wikipedia "Also, unlike in classical mechanics, physical properties (e.g., mass, charge) are spread out over the wavefunction in de Broglie–Bohm theory, not localized at the position...

I am looking for resources on the physical properties of the various components that make up the human body. As an example of what I am looking for; If we look at the finger, we know it has bones, skins, nails, blood etc. What are the various physical properties of these different parts...

Hi, I was reading up on the properties on various materials but never quite found out what I was looking for. My question is this , I found out an explanation why diamond is the best thermal conductor even though its not a metal and why other materials that would be similar to diamond like glass...

Let U be a universal set, and let C be any subset of U. Let R be the relation on P(U) defined by A R B if $A \cap C = B \cap C$. Determine whether the relation is reflexive, symmetric, and/or transitive. Prove you answer.