Properties Definition and 1000 Threads

I beg forgiveness if this should be in chemistry; to me it seems more of a physics problem. This summer I had two Polyethylene terephthalate (PETE) spice bottles deform due to the sun shining on the clear plastic tub, Polypropylene(PP) in which they were stored. The first time the big tub was...

Hello , firs of all I know that every magnet has two poles ad the field lines exit one pole and enter into the other , now if we take a bunch of magnets , for simplicity assume an infinitely long line of magnets each separated by a distance , all of the magnets facing N-S N-S N-S , now do the...

Hi, I'd like to know the log properties when they are the power of a constant. I've searched everywhere but I can't find it. the reason I want to know it is that, when solving a recursion tree problem, my teacher got an result of n^(log4 3) but I got 3^(log4 n). the base of the log haven't...

My prof was going over some definitions and he made a statement about ratios of extensive properties, he said: $$\frac{Extensive}{Extensive}=Intensive$$ But could someone confirm for me that this is only true if I'm doing this with the same extensive property. In other words, as a...

Homework Statement This question being for my physics summer work states "List three properties that all numerical answers must have to be correct" Homework Equations None The Attempt at a Solution 1. must be a numerical value? 2. must show accuracy. 3. must show precision.

Mylar is an insulator, but it is coated with metal. Intuitively it should be possible to wrap a laptop in mylar and insulate the laptop from radio signals... but is there any chance it might affect magnetically the computer and/or its hard drive? I mean a very loose airy wrapping, like in...

Hey guys I'm new here and I've been using MathType for all on-screen math. For some reason PF doesn't recognize the built-in Dirac's bra-ket notation. (i.e. <\psi|) So I've included my equations and solution in the format of images, hopefully it isn't a problem. Homework Statement Proof...

[SIZE="4"]Definition/Summary A Lune is a diangle on the surface of a sphere whose two vertices are opposite points. So the two angles of a Lune are equal, and each of the two sides is half a circumference. The whole surface is a Lune of angle 2\pi. [SIZE="4"]Equations Area of a...

What is difference between iron that we use in food...and iron metal

Homework Statement progressive waves are only for transverse waves ? or it can be also for longitidunal waves? Homework Equations The Attempt at a Solution

Homework Statement Delta functions said to live under the integral signs, and two expressions (##D_1(x)## and ##D_2(x)##) involving delta functions are said to be equal if: ##\int _{ -\infty }^{ \infty }{ f(x)D_{ 1 }(x)dx } =\int _{ -\infty }^{ \infty }{ f(x)D_{ 2 }(x)dx }## (a)...

Hi everyone, I need some specific mechanical properties of A516 carbon steel, but as yet I am unable to find it online. Can you help me find the fatigue limit and the relation between yield strength and temperature? Are there tabulated values for this? Thanks! Mark edit: found it! seems i...

Hi - I am currently working on a paper verifying some thermal hydraulic code against experimental test data for subcooled water subchannel flow. I have close to 1000 points in excel all listed with T & P and the process for inputting the corresponding enthalpies for subcooled water by lookup...

Hi. This is something I've been wondering about. If one looks at a phase chart like this: http://en.wikipedia.org/wiki/Phase_diagram#mediaviewer/File:Phase_diagram_of_water.svg you notice something. First off, as the pressure is reduced, the liquid range shrinks and then disappears at...

Hello :) I am Jon and I am conducting an experiment with Quartz Crystals to test their piezoelectric properties. I wanted to ask you a question about my experiment set up. Which type of force is required to be applied for voltage to be produced? Could I apply a compressive force with...

Homework Statement My textbook says any integer greater than 1 is a product of primes. Wouldn't that mean that there are no prime numbers? What is the product of primes that create the integer 23? Homework Equations The Attempt at a Solution

what is the properties of chimcal reaction for carbon and sulfur in gunpowder...and what different reaction happens if the gunpowder have just carbon without sulfur

I have just finished a post on the Linear and Abstract Algebra Forum on Universal Properties, I am having trouble with the following line of Latex: $$ [a_1]_\sim_R , [a_3]_\sim_R , [a_5]_\sim_R , [a_7]_\sim_R, [a_8]_\sim_R $$ The effect that I wanted for each quotient was as follows: Can...

I am reading Paolo Aluffi's book, Algebra: Chapter 0. I am, at present, focused on Chapter 1, Section 5: Universal Properties. I subsection 5.3 on Quotients, Aluffi writes the following: I am uncertain of the nature of the category that Aluffi is constructing. in particular, do the functions...

Why should we bother about Extensive properties in Thermodynamic systems? and Why do we need specific value of some thermodynamic property? and what does it tell us about the system? Eg. specific heat capacity? How density of a thermodynamic system is a intensive property?

This is one of my weakness in Math, to prove an existing fact. please Tell how to go about doing these problem. 1. Prove that when the discriminant of a quadratic equation with real coefficients is negative, the equation has two imaginary solutions. 2. Prove that when the discriminant of a...

Hi I am a HNC student an am having trouble with this question below... A universal I section beam is simply supported at each end and must withstand concentrated shear force of 240kN vertically downwards. if the maximum allowable shear stress in the beam is to be 65MkN/m^2 determine the...

Hi, I am a Bachelor Student of biomedical engineering and I have a question regarding the complex compressive modulus. I am really a newbie in this field, hopefully somebody can help me. I have measured four different hydrogel films to compare with the same conditions using a dynamic...

12a) Sketch the sinusoidal graphs that satisfy the properties below: Period: 4 Amplitude: 3 Equation of the Axis: y = 5 Number of Cycles: 2 So, I know how to graph sinusoidal functions, but I can't figure out the max and min that would satisfy both the equation of the axis and the amplitude listed.

I was wondering is there is a simple way to show electron's wave properties, by using the double slit experiment as a reference. What I think I need: White Board that's reactive of electrons Something with 2 slits Something that can shoot out electrons For something that can shoot out...

I was watching Fay Dowker's "Spacetime and the quantum: united by history" on Youtube, and a question occurred to me. She has the unique ability to combine enough detail with a popularized version to accurately portray some of the big, current issues facing physics. The question is...

I have recently been learning about the microscope properties which dictates electrical resistance. The main equation (resistivity) in my textbook is: \rho = 2m/qN\tau where \tau is the time between collisions of electrons with the atoms, q is the charge of the electron, N is the number of...

If there are real photons it might be considered reasonable to assume that each photon has certain properties. Here I am interested in finding out all known photon properties, initially by means of making a list. I have started a list and would appreciate if any additions are made to it. I would...

hello everyone.. 1) what is the magnetic properties for indium oxide? i hope that it has ferrimagnetic properties (ferrite) so that i can mixed it with ferroelectric material, to form a multiferroic materials. 2) i have planned to use barium titanate as my ferroelectric material in my...

It is well known that a vector can't be divided by a vector, as a direction can't be divided by a direction. Keeping this in mind, I used the equation, v→ = u→+a→t, and wrote it as t = v→ -u→/a→. Now, isn't it wrong to write the equation like this? As , in it, a vector, that is v→ -u→ is being...

Homework Statement ''A rigid insulated container fitted with a paddle wheel contains 5lb of water, initially at 260F and a quality of 60%. The water is stirred until the temperature is 350F. For the water, determine the work.'' How do we know whether the state of the water at 350F is...

For arbitrary Fermionic self energy, \Sigma(i wn) with wn=(2n+1)pi T, its real part is always an even function of wn while its imaginary part is always an odd function of wn.

In a dipole, p = qd is the dipole moment. q is the magnitude of either charge, while d is the distance of separation. I was just wondering what differences in properties would be evident if both charges in the dipole were not the exact negatives of each other. For example, if you have a positive...

I have a few waves questions I would really like to have addressed. I'll post my logic/solution for each question and any feedback is welcome. Q. 10: This one seems pretty straight forward but shouldn't the units be 3.0 rad/m? Since x is in meters and we're not changing the order of...

I am having a hard time understanding the concepts of a universal property :\ What are they used for? Do they abstract the notion of constructing mathematical objects? Can the concept of a group be described by a universal property or is this not how it works?

Use the properties of Logarithms to write the expression as a sum, difference, and/or constant multiple of logarithms:

Do such materials exist? If they do, are there materials that go from very high to very low thermal conductivity depending on electrical input?

Wave function and its first derivative must be continuous becaus wave function is solution of Schroedinger equation: Let's examine one dimensional case. ## \frac{d^2 \psi(x)}{dx^2}+V(x)\psi(x)=E\psi(x) ## David J. Griffiths gives a problem in his quantum mechanics book...

Let me start off by stating that I have no formal education in Astrophysics, or any other education beyond high school, so if my question is stupid, just say so! Dark Energy, from my understanding Dark Energy is used to explain the expansion of the universe, because when we look at distant...

If a red light drops on a red object, we know that all of the red light is reflected, and none is absorbed. But what happens if a red light drops on a white surface, is all of the red light reflected, will the intensity of the reflected light be the same? Or will the reflected light be of a...

Homework Statement Which of the following phases is capable of permanently withstanding a force perpendicular to its surface? A. Gas B. Liquid C. Solid D. All of the above Homework Equations The Attempt at a Solution I understand that the answer is D. However, what does...

Homework Statement I am solving a problem and I arrived near the end, and can't figure out what to do here: (1/(2m)) [P^2,X]+[P^2,X] m - mass P - Momentum operator X - Position operator Homework Equations P = -iħ(∂/∂x) [A,B]=AB-BA [AB,C]=A[B,C]+B[A,C] where A, B...

I am learning Chemistry from one book and I have bumped onto a following image with given tasks: What is the balanced reaction? What is the RMM of thiazole? What is the fuel-air mass ratio? What is the oxygen depletion? What is the yield of CO2? What is the...

Homework Statement Construct a function f:C \rightarrow C such that f(x+y)=f(x)+f(y) and f(xy)=f(x)f(y) (aside from the identity function) Hint: i^2=-1 what are the possible values of f(i). The Attempt at a Solution All I've been able to do so far is come up with some (hopefully correct)...

Hey! :) I have to show that if $f:[a,b] \to \mathbb{R}$ is integrable,then $f^2$ is also integrable. Knowing that $f:[a,b] \to \mathbb{R}$ is integrable,does this mean that $f$ is bounded??

Parody math paper - defining "properties" And no, I don't mean properties in the mathematical sense, but rather in the "everyday" sense. In a parody mathematics paper I'm writing, I'm trying to define the "properties" of an object as a stepping stone to defining similarity. If we let P(o) be...

I've been thinking about some common properties of mathematical objects and I've been wondering if they are redundant. Like: Aren't all associative operations also closed under a set? Doesn't the existence of inverses imply the existence of an identity element? So that stating associativity...

Homework Statement . A space ##(X,\Sigma, \mu)## is a complete measure space if given ## Z \in \Sigma## such that ##\mu(Z)=0##, for every ##Y \subset Z##, we have ##Y \in \Sigma##. In this case, prove that a) If ##Z_1 \in \Sigma##, ##Z_1ΔZ_2 \in \Sigma## and ##\mu(Z_1ΔZ_2)=0##, then ##Z_2...

Homework Statement The demand for good A is unit elastic. This means that a 5 percent increase in price will ______ A) result in an infinite increase in the quantity of A demanded. B) result in a 1 percent decrease in the quantity of A demanded. C) result in 5 percent increase in quantity...

I'm an undergraduate studying math taking intermediate proof-writing courses, and there are certain basic identities of set theory and functions that still confuse me - i.e., I have to reprove them or think about them carefully every time. Examples: $$(A\times B)\cap (C\times D)=(A\cap C)\times...