Thermodynamic Definition and 459 Threads

1. Five moles of an ideal monatomic gas with an initial temperature of 124*C expand and, in the process, absorb an amount of heat equal to 1140J and do an amount of work equal to 2200J . What's the final temperature 2. Q=m1.5R delta T 3. I tried adding 1440 to 2200 as Q and...

Latent heat of vaporization "Water" thermodynamic -first of all I want to know if the "latent heat of vaporiasation " of water is related to the initial pressure of water ? -If LHV of water is variable with the variation of pressure , how can we calculate the heat needed to vaporise a...

Can you check over my answers to see if my reasoning is correct? Homework Statement #3) "Yesterday I woke up and it was 20°F in my bedroom," said Mert to his old friend Mort. "That's nothing," replied Mort. "My room was -5.0°C." Who had the colder room, Mert or Mort? Homework Equations...

Hello, I was wondering if there has been any theoretical work regarding the thermodynamic justification of the Exclusion Principle. It is my view that all open systems proceed to the lowest free-energy state and all closed systems go to the highest entropy state. Of course, these states must...

Homework Statement The problem is on the attachment. I can't seem to find the volume or temperature of T. If someone can tell me how to find them i can do the rest of the problem. Any help would be greatly appreciated. Homework Equations The Attempt at a Solution on the attachment

Homework Statement Show that the average number of photons per unit volume in the cavity for a temperature T is given by n=( I / Pi^2 . (kT/c(h-bar))^3 ) where I = integral from infinity to 0. dx x^2 ((exp (x)-1))^-1 = 2.404 Homework Equations You may assume the mean number...

I'm reading Enrico Fermi's "Thermodynamics" book. In page 3 of his book, he says: It is evident from what we have said that the knowledge of the thermodynamical state alone is by no means sufficient for the determination of the dynamical state. What does he mean by dynamical state...

Homework Statement A gas in a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes. Process 1-2: adiabatic compression with pV1.4 = constant from p*1 = 50 psia and V1 = 3 ft3 to V2 = 1 ft3. Process 2-3: isometric, Process 3-1: isobaric with U*1 - U*3 =...

Could a 10 HP diesel engine be made as fuel efficient as say a 100 HP diesel engine, that is (work done/fuel used). Does thermodynamics prevent a smaller engine from being more efficient? Thank you for your time.

Can anyone recommend supplementary texts books for Electromagnetism and Thermodynamics? I'm looking for some alternatives to my recommended textbooks. The first class is an electromagnetics class. This class is heavily calculus based and consists of building up concepts that culminate to...

Homework Statement A restaurant refrigerator has a coefficient of performance of 4.5. If the temperature in the kitchen outside the refrigerator is 28^\circ C, what is the lowest temperature that could be obtained inside the refrigerator if it were ideal?Homework Equations According to...

Homework Statement Here is the question: http://img93.imageshack.us/img93/9159/snap1k.jpg Homework Equations First law: Q=W+U Second law: no thermodynamic system can convert heat into work 100%; heat flows from hot to cold reservoirs spontaneously; entropy always increases The...

http://img527.imageshack.us/img527/1541/physix.jpg Can someone help me with this problem? I'm thinking you have to do some sort of integration but I am unsure.

I am wondering if anyone can confirm this answer I got for the following problem; A coal burning electrical power plant burns at 706 degrees celsius. Heat is exhausted into the river near the power plant; the average river temperature is 19 degrees celsius. What is the minimum possible rate...

I'm having a little trouble in completing this problem. I would appreciate your answer if anyone knows how to solve it. Thanks An ideal refrigerator removes heat at a rate of 0.15kW from an interior temperature of 1 degree celsius. The exhaust from the refrigerator is 45 degrees celsius. How...

Hi, How can I find the thermodynamic work from dw=Pdv if P, Vand T are not constants? what if I knew that dp/dv is a constant in this case?

Anyone have the learning source for Thermodynamic ? Can share it here? Thx =)

Homework Statement Use the definitions of Helmholtz free energy, F, and Gibbs free energy, H, together with the thermodynamic identity, to show that S = -(\frac{\partial F}{\partial T})_V and S = -(\frac{\partial F}{\partial T})_P Then use those definitions again, and the...

There is an air bubble at a certain depth and it's rising to the surface of the water. The temperature of the water is constant at a certain temperature. The gas inside the bubble expands as it rises to the surface, but does the temperature of the air stay the same? Is this an isothermal or...

Homework Statement Consider filling a cylinder of compressed argon from a high-pressure supply line. Before filling, the cylinder contains 10 bar of argon at room temperature the valve is then opened, exposing the tank to a 50 bar line at room temperature until the cylinder reaches 50bar...

Hi I have been learning about the Carnot and Rankine Cycles, where process 4-1 is through a evaporator, process 1-2 a turbine, 2-3 a condensor and 3-4 a compressor. Sketching this on a T-s diagram gives straight horizontal lines for processes 4-1 and 2-3. This is where the heat is extracted...

Are all suspensions, emulsions and foam thermodynamically unstable?

Homework Statement The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 2.5 multiplied by 105 Pa, and the horizontal divisions represent 1.5 multiplied by 10-3 m3. Determine the work done (including algebraic sign) in each...

Maybe this counts as computational physics, or statistics I don't know where this topic belongs. Ok so I have this nice high quality Thermodynamic measurement data and I have to start the "data raping" for results. Let's call the series A(t), and B(t) and I have a few more. So for different...

Do sudden changes occur in thermodynamic systems? If so, when do they occur and why? More specifically: When a system is nearing thermodynamic equilibrium, will the process always be slow, gradual, and uniform; or do sudden changes — sudden jumps — sometimes occur?

Homework Statement An ideal diatomic gas, in a cylinder with a moveable piston undergoes the rectangular cyclic process shown below. Assume that the temperature is always such that the translational and rotational degrees of freedom are active but the vibrational modes are "frozen out". Also...

Homework Statement We mix 0.6 kg of water at a temperature of 25°C with 0.8 kg of alcohol at 30.5°C. They come to equilibrium. (Here's some useful data: The specific heat capacity for water is 1 kcal/kg°C = 4186 J/kg°C, and for alcohol it is 0.58 kcal/kg°C = 2430 J/kg°C What is the change...

Homework Statement A rigid container holds 0.680 g of hydrogen gas. How much heat is needed to change the temperature of the gas From 50 K to 100 K? From 250 K to 300 K? From 550 K to 600 K? From 2250 K to 2300 K? The Attempt at a Solution I calculated the first one using delta E_th =...

Homework Statement Suppose 7.67 kg of molten (liquid) lead at its melting point is poured into 764 g of water at 53.3o C. How much of the water boils? Homework Equations mc(detla T) = m(water)c(detla T). The Attempt at a Solution i m guessing i have to do the dollowing: mc(detla...

Imagine processing the gas clockwise through Cycle 1 and then counterclockwise through Cycle 1. Compare these two processes on the basis of the heat energy transferred to the gas in the entire cycle. Choose the correct comparison symbol. Q_clockwise for Cycle 1 <,=,> Q_counterclockwise for...

Homework Statement A 3000 cm3 container holds 0.10 mol of helium gas at 300C. How much work must be done to compress the gas to 1000 cm3 at constant pressure? How much work must be done to compress the gas to 1000 cm3 at constant temperature? The attempt at a solution W = integration...

Homework Statement Set up thermodynamic cycle for determining the enthalpy of hydration of Mg2+ ions The following enthalpies are given Sublimation of Mg ionization energies of Mg dissociation enthalpy of Cl2 electron gain enthalpy of Cl enthalpy of solution of MgCl2(s) enhalpy of...

Homework Statement A cylinder contains one liter of air at room termperature and atmospheric pressure. At one end of the cylinder is a massless piston, whose surface area is 0.01 m^2. Suppose that you push the piston _very_ suddenly, exerting a force of 2 kN. The piston moves only one...

Homework Statement I'm reading through my textbook and doing examples on polytropic process. I see this step and cannot figure out how the textbook gets V3 = 0.0169 m3 P2V2n = P3V3n (500 kPa)(0.05364 m3)1.2 = (2000 kPa)V31.2 V3 = 0.01690 m3 Homework Equations Not sure what to add...

Homework Statement a) By how much does the temperature of an ideal monatomic gas change in an adiabatic process in which 2.0 kJ of work are done on each mole of gas? b) By how much does the temperature of an ideal diatomic gas (with molecular rotation but no vibration) change in an adiabatic...

Homework Statement One mole of an ideal gas does 3000 J work on its surroundings as it expands isothermally to a final pressure of 1 atm and volume 25 L. Determine a) initial volume and b) Temp of gas Homework Equations The Attempt at a Solution Well, its isothermal, so Temp is...

Homework Statement hi, can anyone help me with this problem? a motorist equips his automobile tire with a relief type valve so that the pressure inside the tire never exceeds 240 KPA(gage). He starts a trip with a pressure of 200 KPA(gage) and a temp. 23'C in the tires.During the long...

Homework Statement I have filled in a couple of spots as seen below, but I am a little confused as to how to proceed. If I get a good hint on one, I am sure the rest will follow. I think I am overlooking something obvious here. I know that in a cyclic process, all E (internal)...

Starting from the equation dE=tdS-PdV+\mu dN It is straightforward to derive all 8 possible thermodynamic potentials. My question is the following: Why are the only important potentials Entropy Helmholtz free energy Enthalpy Gibbs free energy Grand potential ? Why aren't the other three as...

What kind of thermodynamic process is the compression of a gas when the volume varies reducing it, and the temperature increase, and there is an exchange of temperature with the exterior (the walls of the compressor are refrigerated, but I assume that the gas will increase its temperature a...

Homework Statement If there's a polytropic process (n = 1.51) compressor that compresses air (Ideal Gas) as: In: 100 kPa @ 25c Out: 30 MPa Given Data: Mass (m) = 105 kg, Work done by compressor (W) = 160000 kJ a. What is the exit temperature of the air from the compressor? b. If an...

[SOLVED] Thermodynamic ( quantity of heat) Homework Statement Calculate he quantity of heat that needed to transfer 2,0 kg ice of -10C to steam/vapor of 100C The process in this case take place in a good heat-isolated container with heat capacity of 500J/KgHomework Equations Q=mcT Q+-ml...

the question is in the attachment. All i really want to know is when you have to find the final pressure and temperature do you use the equation p1 v1^k = p2 v2^k where k is the the polytrophic index thanks

[Sorry about the long post] I'm doing an essay where I am exploring whether or not elements were, for the most part, formed under conditions of thermodynamic equilibrium. We know that some element clearly aren't (such as Potassium 40 and uranium which decay radioactivly). I've scoured the web...

Homework Statement A thermodynamic system changes isochorically from state A to state B where the temperature is greater than state A. The system then expands isobarically to state C where the temperature is greater than state B. From state C the system returns to its original state A linearly...

Homework Statement An air-conditioning system is to be filled from a rigid container that initially contains 5 kg of liquid R-134a at 24 degrees Celsius . The valve connecting this container to the air-conditioning system is now opened until the mass in the container is .25 kg, at which...

[SOLVED] 2 Thermodynamic questions Homework Statement 1. a) Determine the work done on a fluid that expands from i to f as indicated in picture below. b) How much work is performed on the fluid if it is compressed from f to i along the same path...

I have a question about the deduction of First Thermodynamic Law. The book that I have is written by Paul A. Tipler and Gene Mosca and it is called Physics: For Scientists and Engineers. The way to deduct it is given here: @constant volume, Qv=Cv(T2-T1) Because W=0, E2-E1=Cv(T2-T1)...

An ideal gas originally at a temperature T1 and pressure P1 is compressed recersibly against a poston to a volume equal one-half of its original volume. The temperature of the gas is caried during the compression so that at each instant the relatoion P=AV is satisfied, where A is constant. Find...

1. Homework Statement Two moles of an ideal gas are carried around the thermodynamic cycle shown in Fig. 18-29. The cycle consists of (1) an isothermal expansion A to B at a temperature of 700 K, with the pressure at A given by pA = 9 atm; (2) an isobaric compression B to C at PC = 4 atm...