Cycle Definition and 617 Threads

Homework Statement A monatomic ideal gas has pressure p_1 and temperature T_1. It is contained in a cylinder of volume V_1 with a movable piston, so that it can do work on the outside world. Consider the following three-step transformation of the gas: 1. The gas is heated at constant...

Ok most questions (that I have come across) when dealing with the Born Haber Cycle give the Sublimation energy, the Dissociation energy, the Electron Affinity, the Ionization Energy, and the Formation Energy. I know that to get the Formation Energy it is: Hf= Hs+Hi.e.+1/2Hd+He.a.+U (Lattice...

Ok most questions (that I have come across) when dealing with the Born Haber Cycle give the Sublimation energy, the Dissociation energy, the Electron Affinity, the Ionization Energy, and the Formation Energy. I know that to get the Formation Energy it is: Hf= Hs+Hi.e.+1/2Hd+He.a.+U (Lattice...

Hi, I'm just getting properly into electronics. I'm curious as to how fast an analogue circuit can operate. I'm trying to make a circuit which can send an ultrasonic pulse but I need the pulse to operate only for 1/100th of a millisecond. Is it practical or even possible for ordinary...

I'm trying to estimate the temperature of combustion in an Otto Cycle engine, using a formula based on the First Law: T4 = T3 + fQ /cv Where T4 is the combustion temperature, T3 is the air temperature after compression, f is the fuel/air ratio, Q is the heat energy of the fuel, and cv is...

Is the Sun heading towards a Maunder Minimum? [PLAIN]http://science.nasa.gov/headlines/y2006/10may_longrange.htm[/URL] The following is an excerpt from the above link: The sun's "Great Conveyor Belt" And from the next link, it appears there was a failed solar magnetic field...

I am working on a project to design an organic Rankine cycle to convert low temperature thermal energy (waste heat or geothermal) into electrical energy. We are trying to select an expander to extract work from the pressure differential in the refrigerant. The refrigerant (ammonia or R134a)...

I'm currently going through a text about groups, and I'm having problems with composing permutations written in cycle notation, i.e. there are lots of examples and I'm expected to be able to calculate them pretty 'fast', so, is there a way to 'read out' the composition of two permutations direct...

Hi. I have a qualitative question about the work done from state 1 to state 2 of a Carnot cycle. This is the Isothermal Expansion Phase. Is work done by the engine on the environment during THIS PHASE ONLY equal to the energy extracted from the hot reservoir to keep the temperature constant...

Homework Statement http://img132.imageshack.us/img132/2847/img1dy7.jpg shows an 11.7 ft wide ditch with approach roads at an angle of 15 degrees.With what minimum speed should a motorbike be moving on a road so that it safely crosses the ditch.Assume the length of the bike to be 5 ft, and it...

I have a servo motor that I'm controlling with a simple PID controller for a constant frequency square wave with varying duty cycle. My supply voltage is 5.17V with ~1V drop across my low side driver. The controller sits right around 50% duty cycle to keep the servo open to position A. A...

Does anyone have a list of the specific chemicals that are in off the shelf generic 2 cycle oils? Much appriciation if someone can give me an accurate list. Willing to compensate for an accurate list of chemicals and their chemical formulas.

Just checking to see fi I did the math right: During the spin-dry cycle of a wash, the motor slows down from 95 rad/s to 30 rad/s while turning the drum through an angle of 402 radians. What is the magnitude of the angular acceleration of the motor? = 1/2(Wo + W)t 402 = 1/2(95 +...

difference between carnot and rankine cycle. pls give replys

Hey guys. Just trying to program a microchip. Trying to grasp the concept of PWM. I know that varying the duty cycle will vary the speed of my motors...but there are other registers that allow you to set the frequency of the PWM peripheral...NOw I'm getting confused...isn't the duty...

I recently emigrated to the US, and was doing some research in school when I realized the cycle of Republicans and Democrats. A Republican comes into office and offers tax breaks, which raises his public repuatation, while at the same time affecting the economy effectively. Then a Democrat...

I've been working on problem 12-3 in Kittel and Kroemer's "Thermal Physics", and I'm not sure I fully understand what is going on here. As far as I can tell, the system being described is something like this: Gas leaves a compressor at (Tc, Pc) and enters a heat exchanger. The gas leaves...

Two moles of N2 gas undergo the cycle abcd. The pressure of the gas in each state is pa = pd = 5500 Pa; pb = pc = 1500 Pa. Note that 5500 Pa > 1500 Pa. The volume of the gas in each state is Va = Vb = 1.80m^3 ; Vc = Vd = 8.70m^3. Note that 8.70 m^3 > 1.80 m^3. The gas may be...

Sir, One mole of an ideal gas undergoes a cycle change as shown in figure. The process A-B is isothermal. The pressure and volume at A is 1.1 x 10^5 N/m^2 and 22.4 litres respectively. What is the temperature of the gas at C? If the temperature at one point was given the temperature at...

does anyone knows what are the advantages and disadvantages of using a superheated steam cycle (i.e. effect of turbine blade)?

Hello to all, this is my first post on this forum. I'm electrical engineer (technical informatics) but in my spare time I'm interested in thermodynamics especially about steam cycle in power plant. I know that condenser is meant to convert steam to water and here we have pure losses of...

Greetings, A thought occurs about a (possibly) fundamental pattern in nature. Why are there several scales of magnitude in which a smaller body spins, while orbitting a larger body? Examples. 1) A galaxy like the Milky Way has an orbital momentum around the core of its Local Cluster...

I have been learning about the calvin cycle, and have been told that people think that ribulose bisphosphate is first converted into a 6 carbon sugar as a very short life intermediate, and then is converted to phosphoglyceric acid. Why can't you just synthesise rubisco, work out its structure...

i want to know that in qualitative analysis of differential equations why we give more importance to a limit cycle on any other trajectories to show the solution of a differential equation

Greetings nerds! Please just read the bold-style basic question at the end of the message if you don't care what my personal problems are. You'll find out soon enough... when I have summoned founds for my 0.27 billion rockets engines. I have this problem: My "biological clock", the part of...

Lately in our lab, the DC have been growing more rapidly than usual (4 days vs 6 days). Our lab is new to cell culture but according another lab in our department has the same problem. It appears that the problem is seasonal and it start in early in the fall and ends around christmas. Does...

I've calculated the efficiency of the Stirling cycle like \eta=\frac{R(T_H-T_L)\ln\left(V_2/V_1\right)}{RT_H\ln\left(V_2/V_1\right)+C_{mV}(T_H-T_L)} Where V_2>1. It's also derived http://www.pha.jhu.edu/~broholm/l39/node5.html" . But my ("Highschool", or secondary school) teacher says...

Otto Cycle?? Please help ASAP! I have a question that my entire class is confused over. I need help on it for a test, but I have no idea where to go with it. It doesn't seem to fit any of the equations or situations I have been using. The question is: A four-stroke engine runs on the otto...

Please help with the following question, completely lost: The behavior of a four stroke gasoline engine can be approximated by the so-called Otto cycle. The process is as follows (6 steps): 1) Isobaric Intake (from V=0) at atmospheric pressure up to volume V1 (maximal volume)...

I caught a bit on the Today Show that discussed the issue of emotional abuse. Anytime I see something like this it almost always focuses on women who are abused by men. But in my family there was plenty of abuse and it all came from the women - and it still does. Without meaning to start a war...

Sorry about the double post, I had technical difficulties that I was working on and the title of my orginal post got screwed up. I'm having problems getting started on this one. A gas undergoes a thermodynamic cycle consisting of 3 processes process 1-2 compression with...

I'm having problems getting started on this one. A gas undergoes a thermodynamic cycle consisting of 3 processes process 1-2 compression with pressure(p)*volume(V) = constant, from p_{1} = 1 bar V_{1} = 1.6m^3 to p_{2} = ? V_{1} = .2m^3 U_{2}-U_{1}=0 process 2-3 Constant...

The 3D dynamical system introduced in the following site; http://www.geocities.com/tontokohirorin/mathematics/limitcycle/limitcycle2.htm shows not only chaotic behaviour, but also converges to a strange-shaped limit cycle under a certain parameter setting!

I have a question regarding Carnot Cycles and Adiabatic processs. I have cylinder with n moles of a mono-atomic gas with a specific Volume, Pressure and Temperature. This Cylinder is closed by a piston. This system undergoes the four step Carnot Cycle A-B, B-C, C-D and D-A. A-B: Is...

Has an otto cycle engine been developed which gives a non pulsed output?

I'm sure most of you have heard of the Einstein Referigeration Cycle . For those who have not I've listed the references for further reading.. http://www.me.gatech.edu/energy/pubs/SLA_2.pdf ok 342 K is about 156 F ,for anyone with an attic , it seems to me that this is the perfect solution to...

This is a revisit of a site that we have seen in the past, but there has been some updating and it looks promising. This is definitely not what most have in mind when they talk about the internal combustion (re. Otto/Diesel cycle)engine and list the limitations of it. In fact, it's not even...

In brayton cycle, the initial temperature and pressure before compression is less than the final temperature and pressure after work has been done by the hot gases. If the final temperature and pressure is made less than the initial temperature and pressure, would it reduce the efficiency of...

I have a couple of questions about 2 cycle engines: 1) Can someone further explain “time-area” to me in regard to the 2 cycle engine porting? I do grasp the basic concept of time-area values and I do have a formula to calculate the time-area values for a 2 cycle engine however there is still...

hey everyone, I need some help solving the following problem. I am kind of confused on where to start. here is the question from the book. A carnot refrigerator is operated between two heat reservoirs at temperatures of 320K and 270K. a) If in each cycle the refrigerator receives 415J...

An engine with an output of 150W has an efficiency of 25%. It works at 10 cycles/s. A. How much work is done in each cycle? work=power(delta t) = 150 W * 1s = 150 J work =15.0 J per cycle **got part A correct B. How much heat is given off in each cycle? delta...

Having problems with a thermo. cycle! OK, so in the problem A->B is isobaric, B->C is adiabatic, C->D is isothermal, D->A is isochoric. Pa = 2atm, Va = 2 m^3, n = 1mole, Vb = 1/2Va, Pa = 2Pd (That is all the information that is given.) I always end up with the temperatures of B and C...

The question gives a picture of a brayton cycle with temperature on the x-axis and pressure on the y-axis. It is for the monatomic gas, helium, and we are told that there are two moles. The diagram consists of two adiabatic processes and two isobaris processes. You are given two temparatures...

Hi everyone. Sorry... I hope I don't bore you all - I fear this thread will be nowhere near as interesting as the most recent one on this forum on why aircraft fly! Anyway, I have a question relating to the Otto cycle - I'm revising my thermodynamics for an exam and on 1 of the past papers it...

1. Programmer produces code he believes is bug-free. 2. Product is tested. 20 bugs are found. 3. Programmer fixes 10 of the bugs and explains to the testing department that the other 10 aren't really bugs. 4. Testing department finds that five of the fixes didn't work and discovers 15...

I am getting confused between duty cycle and frequency of a pwm. Isn't duty cycle related to frequency? Can someone explain? Thanks & regards

Hello, If anybody could answer this question for me that would be great. I have been wondering about it all morning. In the Diesel cycle for heat engines, on the second stage of operation, the Volume increases while pressure stays the same. I understand how this can be accomplished by raising...

Hello, If anybody could answer this question for me that would be great. I have been wondering about it all morning. In the Diesel cycle for heat engines, on the second stage of operation, the Volume increases while pressure stays the same. I understand how this can be accomplished by raising...

... asked what to study if he wanted to investigate creationism versus evolution. I advised continuing physics and chemistry and avoid having to learn flawed theories as paradigms. So, predictably, I was challenged to expose some of them. I choose for the problems in the 100,000 "ice age" cycle...

How big is possibility to get pregnant if you had unsafe intercourse on 3rd day after your period. Please, please answer me! Thank you !