Process Definition and 1000 Threads

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

Homework Statement 1) antiderivative of ((t^2)+2)/((t^3)+6t+3) dt 2) antiderivative of r(sqrt((r^2)+2))dr help please with these Homework Equations The Attempt at a Solution #2 let u = r^2 + 2 du/dr = 2r du = 2rdr?? i don't knoww!

Homework Statement Initially, 0.745 moles of an ideal gas in a container occupies a volume of 3.55 L at a pressure of 3.82 atm with an internal energy of 1705 J. The gas is then cooled at a constant volume until its pressure is 2.06 atm. Then the gas is allowed to expand at a constant pressure...

A 3.00-L tank contains air at 3.00 atm and 20.0 C. The tank is sealed and cooled until the pressure is 1.00 . What is the temperature then in degrees Celsius? Assume that the volume of the tank is constant. P/T=const 3/20=1/T, T=6.67 C Why it's not right?

This question came some time back in Stony Brooks exam. I have the solution also. But i am having some conceptual doubts. Can someone help me please. The question is: Consider ‘n’ moles of an ideal monoatomic gas placed in a vertical cylinder. The top of the cylinder is closed by a piston...

Hello all, I was just wondering the process behind biodeisels, because I've actually set up doing some volunteer work at a place called Blue Ridge Bio Fuels (or something like that) in NC, and I wanted to know more about it, because I know nothing. Actually, the guy I talked to is a major in...

H1 means hydrogen with mass 1, H2 means hydrogen with mass 2 (has a neutron), etc 1) H1 + H1 -> H2 + positron + neutrino + 1.18 Mev (+0.26MeV) 2) H1 + H2 -> He3 + photon + 5.49MeV 3) He3 + He3 -> He4 + 2*H1 + 12.86 MeV (The neutrino produced in 1 for all practical purposes do not...

:confused:the X-Ray the process is like this: An electron hit the metal so there is a photon is emitted. My Q is what happened to the electron that cases the X-ray And what is K(a),K(b),K(g). Or we call them K(alpha),K(beta),K(gamma).

[SOLVED] Center of Mass Homework Statement A 45.0-kg woman stands up in a 60.0-kg canoe of length 5.00 m. She walks from a point 1.00 m from one end to a point 1.00 m from the other end. If you ignore resistance to motion of the canoe in the water, how far does the canoe move during...

It is actually not a homework, but rather a paper I need to present, talking about the advance attempts to raise microscopy axial resolution. It is said the axial resolution is usually 3 times lower than lateral. The explanation is that the lens from 1 side of focus plane can only produce a...

Hi. Im studying for a chemistry exam, and I am a bit unsure about something. As part of the electrochemistry component of the course i am required to know and understand various metal extraction processes. My book is fairly good for learning them, but one thing i am not sure about concerns the...

I am having trouble with these questions. Can anyone help please 1. How is it possible to have an isentropic process which is irreversible? 2.Why is it desirable to have processes which are less irreversible? 3. Is the expression for the 1st law of thermodynamics for a closed system...

Can a capacitor be used to fuel the electrolysis process?

http://en.wikipedia.org/wiki/Gram-Schmidt_process Can Gram–Schmidt process be used to orthonormalize a finite set of linearly independent vectors in a space with any nondegenerate sesquilinear form / symmetric bilinear form not necessarily positive definite? For example in R^2 define \langle...

if one were to electrictally produce Cl from salt solution how would you tell when all the salt was electroliticaly converted to NaOH and Cl2?

To Forum Physicists / Administrators... Equations for an ideal gas undergoing an adiabatic process are 3 viz 1) P(v^g)=const 2)T(V^(g-1)) =constant and 3)T(P^((1-g)/g))= constant where g=specific heat for const pressure/specific heat for const volume.These equations suits the Ideal gas...

I have been unable to find this topic discussed in "search forums" [ If it has been, I am deeply sorry]. Is Process Physics useful? Is it mature enough to spend time studying and learning it? What is, so far, the general consensus in the community about its value...

does the fusion process cause a chain reaction? or in a fusion reactor are lots of hydrogen atoms released to produce energy. does a fusion reactor heat water and produce steam to generate electricity? if you know anything then please let me know. thanks

Homework Statement i have a thermdyanmics process. with a constant pressure, constant volume and adiabatic. please see the attachment. Homework Equations from C->A (constant pressure) so change in pressure = 0 equations needed to do this problem: Pressure* V = n *R* T...

I was talking to a guy the other day who said that back in 1954 he worked for the military on nuclear reactors (or something along those lines). He said that back then there were nuclear processes where all of the energy could not be accounted for. This missing or extra energy was very small and...

Military Judges Dismiss Charges for 2 Detainees http://www.nytimes.com/2007/06/05/world/americas/05gitmo.html Will wonders never cease? Some of my faith is restored.

Homework Statement 1) In a sequential process, U(235,92) plus a neutron forms the compound nucleus [U(236,92)]* which then fissions; the fissions then produces decays. If the initial fission fragments are Ba(143,56) and Kr(90,36), illustrate a process leading to the final stable nuclei...

In an isothermal process, does the temperature of an ideal gas remain constant? And if so does the heat capacity at constant volume = zero?

If a process is adiabatic and reversible, such as a gas in a tube that has been compressed, is it true to say that there is no change in entropy from the gas being uncompressed to being compressed? If not, why not?

Methanol, CH3OH, is synthesised on a commercial scale by pumping a mixture of carbon monoxide and hydrogen through a reaction vessel containing a mixture of CR2O3 and ZnO. In the reaction vessel, equilibrium is reached according to the equation CO + 2H2 CH3OH Suggest two methods...

This is as I currently understand it: Phonon thermal conductivity is dependent on the phonon mean free path. To define phonon thermal conductivity a mechanism whereby phonons can be brought into thermal equalibruim is required. This is what I have a problem with: Phonon interactions...

Homework Statement A pot is half filled with water and concealed by a lid so that no vapor can escape. The pot is then heated on a stove so steam is formed inside the pot. Now the heat is turned off and the vapor condenses into water. Explain when the process is reversible/irreversible. The...

In an alpha decay the alpha particle doesn't have any electrons orbiting around it, right? But what about the remaining daughter nucleus? And where do the electrons go if they go?

please explain me in easy words . what is reversible and irreversibe process and give some daily examples. thank you.

Homework Statement 3.14 (0.5) How is the fractional change in temperature related to \frac{dT}{T} the fractional change in pressure \frac{dP}{P} ? (IPhO 2006) Homework Equations PV^{\gamma}=\rm constant The Attempt at a Solution nC_vdT=-PdV (1), dV/dP=-nRT/(P^2) If I...

what are the properties of this alloy about grain boundary?and what is the process to have magnetic property to this alloy?

Homework Statement for an ideal gas if the molar heat capacity varies as c=Cv+3at^2 find the equation of the process in terms of temperature T and volume V where a is a constant Homework Equations The Attempt at a Solution i have no idea

Mixing Differential Equation -- need confirmation of the process. Homework Statement There is a box with 320 cubic feet of air mixed with .2 pounds of some some impurity. A small ventilation fan is added to the box at one end. Find the flow rate (R) of the fan as such that no more than .0002...

Hello, I wonder why the process of diffusion takes place... Why should the molecules of gas for example, travel from a region of higher concentration to the region of lower concentration till an equilibrium is achieved? I'll be thankful for your guidance :)

Isothermal means constant temperture process. But thermal means heat. Presumably iso is short for isolated. So it should be isolated heat process or constant heat process rather than constant temperture process. Instead adiabatic means constant heat process. Even though it is a trivial matter, I...

Hi, I have This probability problem and I don't know how to do it: A company makes plastic panel used in automobiles. The panel production process is such thast the number of flaws on a panel follows a Poisson process with a mean of 0.03 flaws per panel. 1- If one panel is randomly...

I'm fairly familiar with the design and operation of an ion engine, although I do have a two questions in regard to its operation. 1) Normally, an ion engine would be used in space (which is naturally a vacuum) and would output its given thrust. Prior to space flight, is there a need to...

Hi people! So i have a homework question that i am stuck on! Four moles of an ideal monatomic gas undergoes an adiabatic expansion from intial volume of 1m cubed and a temperature of 300k to a final volume of 10m cubed. a) How much wrk is done by the gas ? b) what is the final temperature...

I am wondering if there exist some solution to the general stochastic differential equation (SDE) such that I get a time independent pdf(x) while the stochastic process Xt is nonstationary.. I really need some help with that..

Let {S(t), t=1,2,...} be a zero-mean, unit variance, second-order stationary process in R^1, and define Y(t)=S(t)+k(t-(n+1)/2), t=1,2,...,n. Then the process Y(t) is not second-order stationary process since it is contaminated with linear trend, k – degree of contamination. Define R(h)...

Hi, I was wondering how to tell if a part is an ingot or continuously cast. I'm looking at a high strength steel. It's a part of a bulldozer and has some bolt holes. I was wondering if people could offer some guidance as to how I should proceed to figure out the processing steps taken to...

[SOLVED] m-dependent stationary process Hi all Could you tell me a strict mathematical definition of "m-dependent stationary process" or maybe a link to where I could find it Thanks In Advance

Hi, I have only taken two semesters of Physics, so please keep that in mind when answering. Thanks! OK, I have heard of fission and fusion, and I basically understand them. Smash together some mass, and the result is a little bit of missing mass which creates a ton of energy. I have...

fully adiabatic process? :confused: by definition i know that adiabatic process is a thermodynamic process in which there is no heat transfer and it the same time i also know that nothing is frictionless even though we sometimes assume thing to be. so therefore there will be always heat...

:confused: :confused: i was reading my lecture note over the half term but i am still a bit confused and i was wondering if someone could describe in detail, using a p-v diagram, a well known engineering cycle which specifies a isothermal or adiabatic process. Thanks you very much

is it possible to have a process that is both adiabatic and isothermal? i would appreciate if someone could explained that to me. if possible, could you please give me an example in real life. Thanks

Homework Statement Consider 1 gram of an ideal gas undergoing isobaric process. Suppose del(H) be the amount of heat given to it. Then, del(H) = dU + del(W) del(H) = 1 x C(v)dT + (P.dV)/J...

Homework Statement It is said that the work done between 2 isothermals is independent of the adiabatic. Homework Equations The work done during an adiabatic process is given by, W = C(v){T1 – T2) The Attempt at a Solution From the above equation it is clear...

Hi, everyone. i have several questions about thermodynamics which I just read. 1. Why does a reversible process require equilibrium of the system all the time? 2. Is every process reversible if it's very very slow so that the system is in equilibrium all the time( and there's no friction...

Hi, I was wondering if someone could give a brief overview or point me towards a good website describing the gram-schmidt process, its not covered in my text and i need to learn it. Thanks.