Process Definition and 1000 Threads

I know that in collage, you need to take a mechanical/electrical engineering courses, but what is the design process for weapon making? As in, the thought process of creating it?

Homework Statement Show that in a reversible adiabatic process, for 1 mole of ideal gas P1V1γ=P2V2γ Where, γ=CP/CVHomework Equations Listed above.The Attempt at a Solution Frankly, I don't really understand what I'm being asked to do.

Hi all, When random walk takes the steps at random times, and in that case the position X_t is defined as the continuum of times t≥0, isn't this concept/phenomenon/rule is Brownian motion (Weiner process)? At http://en.wikipedia.org/wiki/Wiener_process in section "Characterizations of the...

Homework Statement In a constant-volume process, 208 J of energy is transferred by heat to 0.99 mol of an ideal monatomic gas initially at 290 K. (a) Find the work done on the gas. (b) Find the increase in internal energy of the gas. (c) Find its final temperature. I just don't...

Homework Statement Given that P & V increase in direct proportion such that When P= 1 atm, V= 1L; P=3 atm, V=3L Describe a possible setup for the pressure to rise as the volume increases. Homework Equations F/A=P V= 2pi.r.h The Attempt at a Solution Suppose a system of 1. a...

Hi all, I know that Brownian process can be shown as Markov process but is the converse possible? I mean can we show that a markov process is a brownian process? Thanks in advance.

Homework Statement http://s9.postimage.org/5iw5rixyl/image.jpg (sorry doesn't let me embed) Homework Equations P1V1=P2V2 and PV=nRT I know that Work done by gas from a --> b = (nRT)*Integral(V2/V1) My question is do i use PV=nRT to find N? and if T is constant (isothermal) what do I plug in...

hi ... These days i am trying to make sense of the various processes of thermodynamics and so far i have tried the isothermal process , and isochoric process (which is quite simple i think). Now i am trying to describe what i have understood by the isobaric process: According to the basic...

I don't know the process in which a free electron finds its way back down to the ground state of a hydrogen ion and thus forming a neutral hydrogen atom. I have tried my hand at Googling the topic, but I can't seem to find any detailed websites about the electron-ion recombination for...

Hi all, I am trying to understand the process of Hawking radiation in the case of an eternal (static/everlasting) black hole. As a bit of background: i understand (semi-quantitatively) how one gets particles produced when one is a frame with constant acceleration. And I sort of understand...

I need a little help on how does the iteration process. I know how Runge-Kutta 4 works, but I don't know how this Fehlberg one does. So apparently the iteration goes like this...

I know this question has been done to death and I have had a look through past questions on this forum and others but I can't find anything that is helpful to this particular question! Homework Statement An ideal monatomic gas expands reversibly at a fixed pressure of 10^5 Pa from a...

I have a regular curve, \underline{a}(s), in ℝN (parameterised by its arc length, s). To a running point on the curve, I want to attach the (Frenet) frame of orthonormal vectors \underline{u}_1(s),\underline{u}_2(s),\dots, \underline{u}_N(s). However, looking in different books, I find...

Hi everyone, I'm trying to get my head around scattering still. The books I've been looking at derive it, but then kind of skip some steps when they actually do problems with it. This is long but I'd really love it if someone could help me understand! From what I can tell, this seems to be the...

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...

Hi everybody, I try to figure out connections and differences between random variables (RV), random processes (RP), and sample spaces and have confusions on some ideas you may want to help me. All sources I searched says that RP assigns each element of a sample space to a time function. I want...

Homework Statement In a diesel engine, the piston compresses the air-fuel mixture from an initial volume of 630 cm^3 to a final volume of 30cm^3. If the initial temperature of the air-fuel mixture is 45 degrees C and the process is occurring adiabatically, determine the final temperature...

Hi guys, I've come across an abnormality at work with regards to Carbon Content. The raw material used was 1010 CHQ which should have a carbon content of 0.08 - 0.13. However after going through a cold-forging process, we tested the final product and found that the Carbon Content...

I've recently gained an interest in solar cells and it's development. I know the basic working principle of solar cells, but other than that I'm quite clueless about the field. I was wondering, what is the process of increasing solar cell efficiency like? Are there analytical ways of...

David W. Breneman from Amherst College in Massachusetts wrote a paper for his doctoral dissertation in economics titled "The PhD Production Process". He is writing it from the viewpoint of an economist, so in it he analyzes the motives of professors as well as of graduate students concerning the...

If we speculate from a scientific perspective: - Is life the goal or merely a side effect of the universe process? - Are there more scientific reasons/arguments to assume that life is the main purpose of the process than not? (if we assume that there is a higher purpose of the process, above...

Another thread in this section (https://www.physicsforums.com/showthread.php?t=619945) raises some interesting questions. I can't figure what the original poster there is asking, so I think it best to put what I'm asking in a new thread. A simple "field test" of a system that detects a...

[b]1. We have some gas in a container at high pressure. The volume of the container is 469 cm^3. The pressure of the gas is 2.52*10^5 Pa. We allow the gas to expand at a constant temperature until its pressure is equal to the atmospheric pressure, which at the time is .857*10^5 Pa. (a) Find...

Homework Statement Suppose that a mathematically inclined child plays with a basket containing an infinite subset of integers (with some repetitions). If an integer k is present in the basket then there are initially |k| copies of it. The child pulls out the integers from the basket at...

Homework Statement My textbook says that W = i/2Δ(pV) for an adiabatic process. I don't understand :S Homework Equations W=∫pdV The Attempt at a Solution

how is the rapid escape of air from a burst tyre and cloud formation in atmosphere an example of adiabatic process? please explain

Hello, is there a representation of the process taking place in X-ray photoelectron spectroscopy, describing the interaction of an incoming photon with the electron of the atom?

I'm attempting to solve the following problem: A hollow PCB dissapates 20W into air which enteres at 32 degrees C, 1atm, and a volume flow rate of 800cm3/s. Find the average temperature the air leaves at. I started by first simplifying the second law energy balance equation...

It is well known that a Hermitian symmetric complex matrix A, A^{\dagger}=A can be taking into a tridiagonolized form: A=V^{\dagger}HV where ^{\dagger} is Hermitian conjugate and H is the tridiagonal Hessenberg matrix, and V^{\dagger}V=VV^{\dagger}=I. This decomposition is realized using Schmidt...

Homework Statement I have hydrogen in a 12 L tank, at T=15 C. Some of it is used, the T = const. and Δp=0.4 MPa, the molar mass of hydrogen is M=2*10^-3 J/(mol*K). Find the mass of the used hydrogen. Homework Equations Am I wrong in simply using: \Delta m=\frac{M}{RT}V\Delta p ...

Hi everybody... I've been working through N.G. Van Kampen's "Stochastic Processes in Physics and Chemistry" and have run into something that has got me sort of stumped. He defines the Ornstein-Uhlenbeck process (a stationary, Gaussian, Markovian random process) in terms of the transition...

Homework Statement Ideal gas initially at temperature Ti, Pressure Pi, Volume Vi is compressed reversibly down to half its original volume. Temperature of gas is varied during the compression so that P = AV is always satisfied [where A is a constant] Show that the work done on the...

Homework Statement determine the thermal effieincy of a heat transfer process where the following data has been used Input=3kW 1.7 litres of water have been heated from 313K to 375K in 2.5 minutes specific heat capacity of water= 4.19kj/kgK Homework Equations Thermal efficiency=...

Homework Statement The question states that we should use the Gram-Schmidt to find an orthogonal basis for W where W = span {p , q} and p(x) = 1 + x ; q(x) = 1 + 2x^2 Homework Equations ... The Attempt at a Solution Let \{b1, b2\} be such a basis. Using the G-S process: b1 = p = 1 + x b2...

Hi, has it really been proven that the process of fusion is REALLY enough to keep stars from imploding under their own gravitational force? I suspect that there might possibly be another factor involved, in keeping the stars inflated until they start to cool and hit that point of...

Homework Statement A system absorbs QH = 481 J of heat reversibly from a hot reservoir at temperature TH = 370 K, and gives off QC = 155.4 J of heat to a cold reservoir at TC = 156 K. During this process, W = 90.9 J of work is done by the system. a) Find ΔIE, the change in internal energy...

OK, in the quantum eraser set up, you get a bump because of decoherence in the beam that does not pass through the double slit. In that beams causes the vector states of the left and right slit to be orthogonal. Even if you put the pi/4 POL in that beam, there would be two orthogonal states (the...

Hi, I'm a PhD student working on future airframe and propulsion systems and I'm starting to feel that everything in the aeronautical sector seems to have a pre-planned methodology. An example is to design an aircraft .. you can pick up various books and use very old formulas to design it and...

By conditioning on the value of X1, and then thinking of future generations as a particular generation of the separate branching processes spawned by these children, show that Fn(s), defined by Fn(s) = E(s^Xn), satisfies Fn(s) = F(Fn−1(s)) ∀n ≥ 2. I need to prove the above result and...

Why do we recognize a stream of sunlight going through the clouds causing a river to glitter as beautiful. Is it a chemical process? Why would we recognize something like that outside of ourselves that has no use as beautiful? And how would that fit into the theory of evolution and biology if...

Let customers arrive according to a poisson process with parameter st and let $X_{t}$ denote number of customers in the system by time t. Consider an interval [t,t+h] with h small. Show that P(1 arrival)= sh + o[h], P(more than one arrival)=o[h] and P(no arrival)=1-sh+o[h]. I know P(1...

Hi! I really want to know how evaporator is made. i mean it is impossible to made by casting process, but i also not sure. anyboby who involve in this industry can please help me

I'm trying to learn more about Markov chains and came across the Gibbs sampler x_1{t+1} ~ p(x_1|x_2 = x_2{t},...x_n{t}) x_2{t+1} ~ p(x_2|x_1 = x_1{t+1},x_3 = x_3{t},...,x_n{t}) . . . x_i{t+1} ~ p(x_i|x_1 = x_1{t+1},...,x_(i-1) = x_(i-1){t+1},x_(i+1) = x_(i+1){t},...,x_n{t}) Supposedly...

Homework Statement Still can't figure this one out. All data is on the picture attached. I have to find the current flowing through E1 after E2 is connected and draw a graph as it changes in time of the process. I can't do the equations when t=0 Homework Equations dUc/dt|t=0...

Homework Statement A heat engine uses 2 mole of a diatomic gas that follows the pV cycle shown, how much work is done, over the cycle if P=100kPa, T1=207K * P is suppose to be 0.5P this was a typo on the graph This is what I've figured out so far: (if i am incorrect on anything...

Homework Statement Derive an expression for the change in temperature with pressure for an adiabatic process. If a dry air parcel is lifted adiabatically from 1000hPa to 800hPa what is the final temperature if it was initally at 20^{o}C?^{} Homework Equations PV^{k}=constant I derived an...

Hello I'm really confused with this and would appreciate any help. Homework Statement a) Show that the work done on a gas during a quasistatic adiabatic compression is given by: W = \frac{P_f V_f - P_i V_i}{\gamma - 1} b) Show that the work done by a gas during a quasistatic...

Homework Statement Suppose a book of 600 pages contains a total of 240 typographical errors. Develop a poisson approximation for the probability that three partiular successive pages are error-free. The Attempt at a Solution I say that the number of errors is poissondistributed...

What single invention between 1775 and 1913 has had the biggest impact on humanity and why? Also it could be a process like say the Bessemer process or a simple item like the lightbulb.

Dear all, I wonder if anyone has come across this problem before and could point me to a relevant ref or tell me what terms I might search for: I am interested in a continuous time process in which two alternating events (call them A and B) occur. Each event has an exponentially...