Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Homework Help
Introductory Physics Homework Help
Efficiency of a heat engine given a P-V diagram of its process
Reply to thread
Message
[QUOTE="XSummer32, post: 6440932, member: 685933"] [B]Homework Statement:[/B] Hello, I'm attempting a question and I'm not sure what I did wrong with my answer This is the question: A volume of ideal gas, Cv = 1.21R, undergoes a cyclic process, the triangle abc in the p-V diagram. It starts at point a (T = 300 K, P = 3 kPa, V = 1 L) and expands until the volume reaches 6.3 liter at point b. It then gives away heat to the environment at constant pressure until its volume decreases to point c (P = 1 kPa, V = 1 L). Finally, it absorbs heat at constant volume and gets back to point a. Find the efficiency (%) of this heat engine. (hint: find the total net work (W) done, and identify the processes (ab and ca) in which the gas absorbs a total amount of heat Qh. The efficiency is then W/Qh. [B]Relevant Equations:[/B] Q - isothermal = nRT ln(v2/v1) volume constant = nCv * Change in Temperature Work done - Isothermal = -nRT ln (v2/v1) Isobaric = -P * Change in volume Efficiency = W/Qh I post the working in the attached file [/QUOTE]
Insert quotes…
Post reply
Forums
Homework Help
Introductory Physics Homework Help
Efficiency of a heat engine given a P-V diagram of its process
Back
Top