Properties Definition and 1000 Threads

Hi everyone, Im looking for an autonomous first order ode that has the following properties. For dependent variable x: x(t=∞)=0 x(t=-∞)=0 and the function x(t) has one maximum. Any help would be great. Rgds...

A photon has an energy correleated with its frequency. Photons can interfere. Can the same be said for other bosons, like the Higgs?

How do we show that \frac{d}{dt}\left[\int\!y\,\mathrm{d} x\right] = y\,\frac{dx}{dt}

A heat transfer of 9.5 x 10^5 J is required to convert a block if ice at -15°C to water at 15°C. What is the mass of the block of ice? So do I have to use the equation; Q= mcΔT ? and Q= mL ? And if so how do I use it?

At a local county fair, you watch as blacksmith drops a 0.050-kg iron horseshoe into a bucket containing 25.0 kg of water. If the initial temperature of the horseshoe is 450°C, and the initial temperature of the water is 23°C, what is the equilibrium temperature of the system? Here is...

Homework Statement Assuming that all matrices, A, B, C, and D, are n x n and invertible, solve for D. C^{T}B^{-1}A^{2}BAC^{-1}DA^{-2}B^{T}C^{-2}=C^{T} Homework Equations C^{T}B^{-1}A^{2}BAC^{-1}DA^{-2}B^{T}C^{-2}=C^{T} The Attempt at a Solution I must have missed something in...

Say we have a particle, what are the most fundamental properties that distinguishes it from another kind of a particle. What is written in it's identity card? Spin, electric charge, rest mass, mean lifetime.. what else?

Beforehand, please excuse my ignorance in this field, as I am only beginning to delve into its astounding depths. So, as I understand it, Photons are the force carrier particles (gauge bosons) for the electromagnetic interaction (electromagnetic force). This given, one could pretty much say...

When do macroscopic properties of matter come into picture? When we consider 2 atoms, 20 atoms, 200 atoms or 200000000000… atoms? I hope I have conveyed my meaning?

I have an equation (constraint) which I wish to solve explicitly in terms of gd (or more precisely a scaling factor of the vector gd) but I am unsure how to manipulate the equation σi(G) = |uiHgd|-1 Background: (please feel free to skips this. Much of this inforomation is I'm sure...

Homework Statement Thermal energy is transferred to a solid. Three properties of the solid are: 1. volume 2. mass 3. specific heat capacitiy Which of the above properties determine the rise in temperature of the solid? A) 1 and 2 B) 2 and 3 C) 2 only D) 3 only Homework Equations c = Q/mΔT...

Hello Everyone! Suppose $f(x)$ can be written as $f(x)=P_n(x)+R_n(x)$ where the first term on the RHS is the Taylor polynomial and the second term is the remainder. If the sum $\sum _{n=0} ^{\infty} = c_n x^n$ converges for $|x|<R$, does this mean I can freely write $f(x)=\sum _{n=0} ^{\infty}...

Homework Statement An electric generating plant boils water to produce high pressure steam. The steam spins a turbine that is connected to the generator. a) how many liters of water must be boiled to fill a 5.0 m^3 boiler with steam at 50 atm and 400 degrees Celsius. b) The steam has...

Homework Statement Let ej denote the jth unit column that contains a 1 in the jth position and zeros everywhere else. For a general matrix An×n, describe the following products. (a) Aej (c) eTiAej? Homework Equations Rows and Columns of a Product Suppose that A = [aij] is m × p and B =...

Hello, I am trying to prove/disprove the following claims: (1) There exists a sequence a_n of positive number so that the series Ʃ a_n converges whereas the series Ʃ (a_n)^2 diverges. I believe I managed to disprove that. Is it indeed false? (2) There exists a sequence of real...

Homework Statement If lim f(x) as x->5 = -1/2 and lim g(x) as x->5 = 4 find lim [f(x)-g(x)] as x->5 Homework Equations The Attempt at a Solution My question: Am I supposed to substitute f(x) by -1/2 and g(x) by 4 and have [-1/2 - 4]?

Suppose G is a group and g,h are elements of g. Does (g.h)n=gn.hn if we don't know what the groups operation is.

Can someone explain the following statement for me? The best you can, would really appreciate it. "A wave function or wavefunction is a probability amplitude in quantum mechanics describing the quantum state of a particle and how it behaves. " I am trying to learn/understand how something...

If we consider a number 9999999………. infinite times then no other number that can be represented bigger than that without plus or multiply operation. So we can be sure infinity is an odd number am I right

Hi, I'm specifically trying to compute (VΔYT)-1, where V is nxn and orthogonal, Δ is diagonal, and Y is nonsingular. In general we have (AB)-1 = B-1A-1 But how do we do this in general for many matrices? Is there a method, and as long as the matrix dimensions agreed, does the...

How alternating current was transmitted over a long distance? If it is direct current then I can imagine the constant current will flow over that long distance but how ac? Compare with ac, why dc decreases as it is transferred over long distances? Thank you.

Homework Statement Let's consider a distribution function f=f(t,x^i,E,p^i). Is it true that \mathop {\lim }\limits_{p \to\infty}p^{\alpha}f=0 \forall\alpha\in R ?Homework EquationsThe Attempt at a Solution I think so, not sure though. Thanks in advance!

if we place a very thin rod of length 'l' in front of a source of some radiation of amplitude = length of the rod (l) ,and perpendicular to its direction of propagation (assuming all the radiation to be polarized in one particular direction), :- |...

Hello everybody, For a group project, we are supposed to propose several designes for a plank bridge over a river. I've tried to find this material's (plank wood) strength properties, or a stress-strain diagram to no avail. Do you know where I can find it? Also, is it reasonable for a...

Hello, I am new to this: Taking the first Pauli Matrix: σ1=[0 1 1 0] Doing the transpose it becomes: [0 1 1 0] So is it a unitary matrix? Similarly σ2= [0 -i i 0] Doing a transpose =[0 i [-i 0] Does it mean the complex conjugates are...

Hi everyone! Im developing an application with a physics library. In the application I pre-setted some materials with the following properties, Density, Friction and Restitution Im not sure if this informations are truly trustable, Can you guys just review this for me...

Hello everyone For a project I'm currently working on, I need a dc motor which can generate a torque of about 0.1-0.2 Nm (or more) with a rpm of about 120-200...

I'm having trouble finding information on polyhalogen compounds ie CsICl2 when they are dissolved in solution. I've made dichloroiodide and I'm trying to figure out why/what happened when added to HCl/NaOH/and with KI added to both acidic and basic conditions, but I don't know how to...

I have a book on Gaussian but it mainly just explains how to use the program, it only gives very brief explanations of the theory behind how Gaussian does what it does. I want to gain an understanding of how Gaussian performs the various types of calculations that it can do. I understand the...

[/itex]Homework Statement Is the following statement true or false: 'if (cn) and (dn) are bounded sequences of positive real numbers then: lim sup (cndn) = (lim sup cn)(lim sup dn)Homework Equations The Attempt at a Solution for all n in the positive reals. cn and dn are bounded. Since cn...

Hi all, I'm a part III student and taking the QFT course. The following seems "trivial" but when I went and asked the lecturer, the comment was that they too hate such nitty gritty details! The problem is page 12 of Tong's notes: http://www.damtp.cam.ac.uk/user/tong/qft/one.pdf All...

What are the specific properties of time in quantum mechanics? One thing I have often wondered is, Does time exist in multiple quantum states until it is measured? IE. is time an unknown variable until the act of measurement is performed by some kind of measuring device? (a sun-dial, a...

Hello, Please help in solving the four set of problems, i will be very happy explaining comment as really want to understand. The problem will spread to the extent of understanding preduduschey. 1 Problems: The set M, M = {e^(j*2*pi*k/n) , k= 0,1,2...n-1} denotes the set of the nth...

Is there a phonetic symbol that has the the three properties voiceless, glottal and fricative?

Homework Statement Prove that if 0 < a < b, then a < √ab < (a + b)/2 < b Homework Equations To prove this use the 12 properties of numbers (commutativity, trichotomy law, associativity, etc...). The Attempt at a Solution The main problem is I don't know if I need to define the...

Hello, I'm calculating a physics problem and I'm supposed to calculate the height of a building given that: rock is dropped from the building, the sound of the rock hitting the ground is heard 4.8s later, the speed of sound is 350m/s, and I don't know how do I calculate the time since...

I'm really interested in properties of the elements because it is an important philosophical question. A little while ago when I went through my chemistry textbook I wrote down all the properties I encountered. I was wondering if someone would be kind enough to point out some of the properties...

Are there any properties of commonly encountered probability distributions that cannot be effectively estimated by sampling them? Searching for "inestimable" lead to irrelevant links. Those links discussed not being able to estimate some parameters of a model when certain types of data are...

Hi everyone ! Which are the major properties of inertial forces ?

This may sound stupid, but why when I shine a laser pointer at a mirror and reflect in onto another mirror back and forth, the points of light make a parabola when the mirrors are tilted in such a way as to maximize the number of reflections happening? Tilting the mirror further or closer then...

Prove 2 ∤ 1 , assuming the existence of the natural numbers and integers along with their most basic arithmetical and ordering properties. (Not allowed to use rational numbers) 2. Let and b be integers. We say a divides b if there exists an integer k such that ka = b. 3. Well, my...

As the positron has a positive charge and is the mirror of the electron and the antiproton is negative and a mirror of the proton, will then anti-matter produce anti-gravity. If not then why not? Is this linked to the photon pairing of electron and positron?

What If there are other properties of physics we can not percieve due to a limited amount of senses. What if these are properties which are essential to the understanding of the structure of physics. Like a blind person has no way of knowing what a sunrise looks like. Where we are able to...

I don't feel I have a good understanding of what the center of mass of an object it, and what its properties are. I know it's the position of all mass elements weighted by their mass and divided by the total mass. I have learned that the center of mass moves as if it was only subject to...

I have a physics book that says the electrons orbiting an atom are responsible for the physical and chemical properties of that atom. And yet I have managed to find another source which says the number of neutrons can affect the "Density (mass/volume), boiling point, freezing point, and the...

Homework Statement This is copied from a book: $$\eqalign{ & {\rm{Time Differentitation}} \cr & {\rm{Given that: }}F(\omega ) = F\left[ {f(t)} \right] \cr & F\left[ {f'(t)} \right] = jwF(\omega ) \cr & {\rm{Proof:}} \cr & f(t) = {F^{ - 1}}\left[ {F\left( \omega \right)}...

I have a simple question about the intuition behind property 1 of a Wiener Process. It says in my textbook that the change in a variable z that follows a Wiener Process is: δz=ε\sqrt{δt} where ε is a random drawing from a \Phi(0,1) Now I think \sqrt{δt} is supposed to be the standard...

Hello everyone, I read on Wikipedia that a lot of the properties of photons are explained by them being the quanta of an abelian gauge field (link). Does anyone happen to have a good source on this? I haven't learned anything about gauge theories yet, so I'm looking for an introductory text...

I have read for the last 2 years that an electron is a particle that revolves around a nucleus. That has made me believe that an electron has only particle nature however my assumption that an electron has only particle nature has proved false. I want to know what somebody means when he says an...

hello I read about it in a book but I find anything about in the web. How is it formed and how does it behave?