Process Definition and 1000 Threads

Homework Statement A cup sitting on the table contains 200g of water. You measure it at a certain time and it is 20 degrees Celsius. You leave the room and come back 10 minutes later. It is now 25 degrees Celsius. What can you conclude about the heat added to the water? [hint trick question]...

Hello, I'm a Process Engineer in an Aluminum Foundry and haven't been able to find the formula to solve the following problem and I'm hoping someone here can help. I've been digging through old textbooks, thinking this should be simple, but w/ no luck. - Thanks in advance. I've got a vessel...

This is probably a difficult question to answer, but if someone could refer me to some books/journals, I would greatly appreciate that.

Homework Statement An adiabatic process is performed on 15 moles of an ideal gas. the initial temperature is 320 K and the initial volume is 0.80m^3. the final volume is 0.40m^3. the adiabatic constant for the gas is 1.44 the heat absorbed by the gas in kJ is closest to a. 0 b.+54 c.-14...

Homework Statement twenty moles of a monatomic ideal gas (lambda=5/3) undergo an adiabatic process the initial pressure is 400kpa and the initial temperature is 450K. The final temperature of the gas is 320K. The heat absorbed by the gas in kJ is closest to? a.0 b.+54 c.+32 d.-54 e.-32...

Suppose that A and B follow geometric brownian motion, where zA, and zB follow wiener process dA/A=a*dt+b*dzA dB/B=c*dt+d*dzB dzA*dzB=e*dt What stochastic process does A/B follow? This is not a homework question(I am sure it's almost trivially easy to those who learned the stuff). I am very...

Homework Statement If you find a mushroom, what is the chance that at least one more will be within one yard from it ? What is the chance that there is exactly one mushroom within the distance one yard from the point you stay? The mushrooms grow in a forest randomly , with density 0.5...

Dear all, I'm trying to implement an Extended Kalman Filter for position, velocity and orientation tracking of a rigid body and I am using quaternions for representing the orientation in the state vector. As this is the first time I have to work with a Kalman Filter, and the project is on a...

Homework Statement http://img291.imageshack.us/img291/4844/14820448wb9.png The Attempt at a Solution First of all I'm trying to find the expected time of a cycle. In a cycle two things can happen: 1) the car lives long enough to reach A with probability 1-F(A) 2) the car fails to...

maximum work during reversible process? I have seen maximum work is achievable when the process is carried out reversibly. Is it correct? For example, if you look at the following problems, 1) Ten litres of an ideal gas at a pressure of 10 atm expands isothermally against a constant...

Hello, I need help with my fourth-year design project. The part that I need particular help with is how to design an evaporator and how to size the fan that will create the forced convection over the fins. What are the main things to consider in terms of design steps? What are some good...

Homework Statement A sample of 1.00 mol of an ideal gas at 300 K and 101325 Pa is expanded adiabatically in two ways: a) reversibly to .5 atm and b) against a constant external pressure of .5 atm. Determine the values of q, w, \DeltaU, \DeltaH, \DeltaS, \DeltaSsurr, and \DeltaStot for each...

So, the problem is: A 200-gram sample of dry air is heated isobarically. Its entropy increases by 19.2 J/K and the work done by expansion is 1.61x103 J. Solve for the final temperature of the air. Okay, since p=const => dq=CpdT thus instead of dq=du+dw we can write dq=dq(Cv/Cp)+dw can find...

We may say a process is adiabatic if it occurs fast enough such that no heat is exchanged from the system.But we also say a process is quasi-static when it occurs very slow. Then how can PV^gamma = c hold for a fast occurring adiabatic process because a polytropic process should be...

Hi everyone, I know that integration is the inverse process of differentiation, and that the definite integral is defined as: \int_{a}^{b} f(x) dx = \lim_{n \to \infty} \sum^{n}_{i = 1} f(x_i) \Delta x assuming that the integrand is defined over the interval [a,b]. My question is: Why is...

question regarding stagnation state and process! stagantion state: it is reference state defined as the thermodynamic state which would exist if the fluid were brought to zero velocity and zero potential. this is the definition from the textbook fundamentals of gas dynamics b Zucker R.D...

Of course Gonzales says he knew nothing! It was only an aide of his who cherry-picked pro-Bush Republicans: http://www.iht.com/articles/2008/07/29/america/29justice.php

I am having a devil of a time trying to successfully perform an iterative process for a particle’s energy in a finite well. The equation describing the energy for a finite well is transcendental thus requiring a graphical or numerical solution. Although, the graphical solution is straight...

What is the process through which photons are absorbed/emitted from an atom? Also... One of the threads i visited first was this: https://www.physicsforums.com/showthread.php?t=76246" Post number 11, the one by Zoobyshoe explaining what Claude meant by the rope analogy using a billiard...

For an ideal gas PV=nRT where n is the number of moles show that the heat transferred can be written as: dQ = \frac{C_V}{nR}VdP + \frac{C_P}{nR}PdV Really not sure where to start with this... I have used dQ = dU + PdV But it hasn't really lead anywhere.

Doing a Cascade Control lab and I'm stuck on a question. Its asking me how to implement critically damped into a control system. I can't find it any where in my books or the net. thanks.

Feynman refers to "renormalization" as a dippy process on p.128 of his book "QED - The Strange Theory of Light and Matter". His words are: "The shell game that we play to find n and j is technically called renormalization. But no matter how clever the word, it is what I would call a dippy...

Hello Lords of Physics, sorry for pestering you guys again but these days a question about irreversibility is pestering me , my question is Why we say that irreversibility in process is due to finite tempreture difference ? so if there is finite temp diff. why process is not reversible...

What is the physical process common to both the emissions of atomic x rays and nuclear gamma rays? is it photoelectric.. or the inverse.

[SOLVED] Isobaric process Hi, need some help with this. I got to moles of an ideal gas that are heated at constant pressure from T=27 C to T=107C. How do I calculate the work done by the gas? I know that for a isobaric process the work is given by W = p(V2-V1) Thanks

I was reviewing some notes on the Carnot cycle and noticed that to compute the work done along an isotherm you take the integral of PdV from the initial to final volume. What value do you use for P since P is not held constant on an isothermal curve? Why is P treated as a constant?

Homework Statement A sample of an ideal gas goes through the process shown below. From A to B, the process is adiabatic; from B to C, it is isobaric with 98 kJ of energy entering the system by heat. From C to D, the process is isothermal; from D to A, it is isobaric with 158 kJ of energy...

Hello to all, I want to analyze and make model of the water mixing process as shown in file in attacment. Basically, there are two input variables: input hot water flow and cold water flow. There is constant flow FL3. I need to write equation that describe how level and tank's temperature is...

Homework Statement I was wondering if there was anybody in here with an understanding of the photosynthesis process? If so, would you be willing to read my description of it and ensure that all information is valid and accurate. Thanks

work done in an reversible process is easy to find we have the function of P internal bt when it comes to irreversible process then how do we find work done by the gas or on it and if ur answer is (sry i am new to forum i don't know how to use the features) [ integration p external dv] then...

Hai all my friend I have task from my school about Process of Clouds, Rain, and Struktur of Atmosphere when rain fall. i don't have more knowledge about it so please help me Thanks

Homework Statement One mole of helium is enclosed in a cylinder with a movable piston. By placing the cylinder in contact with various reservoirs and also insulating it at proper times, the helium performs a cycle. Compute the internal energy change, heat transferred, and work perfomed for...

Hi! I was just wondering if in a reversible isothermal process, there is a change in internal energy. I know that for the isothermal forward process the temperature is constant so internal energy is constant? What really stumps me is the word reversible.

Homework Statement I'm trying to understand this part of my notes where the optical absorption in both indirect and direct bandgap semiconductors. This part specifically mathematically describes the change in energy and momentum of an electron in a semiconductor after it has absorbed energy...

Homework Statement During an adiabatic process, the temperature of 5.50 moles of a monatomic idea gas drops from 495 C to 215 C. For this gas, find (a) the work it does, (b) the heat it exchanges with its surroundings, and (c) the change in its internal energy Homework Equations I know...

Is evry mechanical process or mechanism reversiible? By that i mean to say, Can we carry out every mechanism or process in reverse? for eg: if i have a mechanism which converts rotary motion to oscillatory, can i use the same mechanism for changing the oscillatory motion to rotary, without...

[b]1. I have a relatively simple question, but I can't think of the answer. A high bp hydrocarbon (X) is obtained by the fractional distillation of crude oil. (X) is then heated in the presence of silicate materials. only 3 new hydrocarbons were from this proces. All I want to know is what...

I'm a BME undergrad and am in what I and many of the people talk to agree is the hardest class they have ever taken. Its a junior level transport phenomena class for biomedical engineers. One of the problems that I think I am having is that in my opinion the book is horrible in that there are...

Homework Statement I have the equation for the internal energy: U = (f/2) * N * k * T, where f is the degrees of freedom, N is the number of molecules, k is Bolzmann's constant and T is the temperature in Kelvin. This can be written as U = (f/2)*p*V using the ideal gas law...

Homework Statement Consider a gas with adjustable volume V, and diathermal walls, embedded in a heat bath of constant temperature T, and fixed pressure P. The change in the entropy of the bath is given by: delta S_bath = delta Q_bath/T = -deltaQ_gas/T = -1/T (delta E_gas + P deltaV_gas)...

Homework Statement For cos(x)-1 = 0, the Newton raphson function is g(x) = x-tan(x/2) Use Steffenson's algorithm with g(x) and start with p0, and find p1, p2, p3, then find p4, p5, p6 Homework Equations Using Aitken's process with fixed point iteration The Attempt at a Solution...

I was working at the energy released through the triplealpha process, and came to a slight problem. I worked out for Helium first, using: (2 x 1.007825u) + (2 x 1.008665u) - 4.002602u = 0.030378u which when x3 and converted gives ~84.9MeV. Doing the same for carbon, but using 12.011u...

Hi, I have an onsite interview with Intel for a process engineering position. I believe this position is mainly for college graduates. I am graduating with a Bachelor's degree in Electrical Engineering in May 2008. I am quite nervous about the interview and want to be as prepared as I can be...

Homework Statement ½ Life and a First-Order Process ln [R]t = -(0.18 d-1 ) (30.d)= -5.5 4.0 x 10 [SIZE="3"]13atom/L [R]t 4.0 x 10 [SIZE="3"]13atom/L = e -5.5 = 0.0042 [R]t = 1.7 x 10...

Stemming form another thread that has gone quiet I have a question with respect to cognitive science. It is interesting to study cognitive science which in essence is the study of learning and thinking. I break how we construct our morals, opinions and values down into phases. 1. We receive...

The process known as sampling in reference to music is as follows: A device called a sampler is used to convert an analog signal representing sound waves into digital information. This digital information is called a sample, artists often use samples in their music. however, this not the only...

Homework Statement V = span(S) where S = {(1, i, 0), ((1-i), 2, 4i)}, and x = ((3+i), 4i, -4) Obtain the orthogonal basis, then normalize for the orthonormal basis, and then compute the Fourier coefficients. Homework Equations v2 = w2 - (<w2,v1>)(v1)/(||v1||²) The Attempt at a...

Homework Statement Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks! Homework Equations The Attempt at a Solution

Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks!

Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks! Is it ture that it would be zero in an adiabatic, process carried in consant temperature?