NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
December 15, 2017, 09:18:23 pm *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
 
   Home   Help Search Login Register  
Music is a higher revelation than all wisdom and philosophy. Complete the mission of life. ..."Beethoven (1770-1827, German composer)"
Google Bookmarks Yahoo My Web MSN Live Netscape Del.icio.us FURL Stumble Upon Delirious Ask FaceBook

Pages: [1]   Go Down
  Print  
Author Topic: Help needed !!!  (Read 11012 times)
0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
vadik
Newbie
*
Offline Offline

Posts: 3

«
Embed this message
on: December 11, 2007, 04:12:45 am »

Hello! I am a new member on this forum..
I need help with Thermodynamics...
I have few problmes that for some reason i don't see how to solve..

Problem 1
 A closed constant volume container of air initially at 150 psia. and 200 F cools down to 60 F. Using the ideal gas model what is the final pressure?

Problem 2
An open feedwater heater takes in 1000 lb/hr of water at 250 psia and 80 F and uses mixing wit saturated steam at 250 psia to provide saturated liquid at 250 psia. What flow rate lb/hr of steam is needed. Assume no hear is lost to the invirement. Look up property values in the back of the text.


Could someone help me solving these two problems?
Thank you very much!
Vadim
Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #1 on: December 11, 2007, 09:36:01 pm »

Problem 1 can be solved by ideal gas law: PV=nRT
n should be the same, R is a constant, You can find out P1, T1 and T2 from the question (with proper unit)

Problem2: Need more information from your textbook. You need to find out by yourself. Wink
Logged
vadik
Newbie
*
Offline Offline

Posts: 3

«
Embed this message
Reply #2 on: December 12, 2007, 12:42:52 pm »

In first problem V (Volume) is not given and i don't know how to find V
Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #3 on: December 12, 2007, 04:56:24 pm » posted from:Taipei,T\'ai-pei,Taiwan

Because the Volume V is the same. (n,R are also the same)
P1 V = nR T1
P2 V = nR T2

You should be able to find out P2 from the above equations.
Logged
vadik
Newbie
*
Offline Offline

Posts: 3

«
Embed this message
Reply #4 on: December 13, 2007, 10:53:46 am »

Yes, i was able to find P2

Thank you for your help!
« Last Edit: December 13, 2007, 10:55:49 am by vadik » Logged
HUMSHAPHY
watchlist
*
Offline Offline

Posts: -10

«
Embed this message
Reply #5 on: November 08, 2009, 11:44:23 am »

Thanks alot for your help I really appreciate it. I was confused by the name programmable shaders. Thanks too the readme and your answer I finally could configure Hellforces. I like the game very much.
Logged

Электронные каталоги автозапчастей
Pages: [1]   Go Up
  Print  
Music is a higher revelation than all wisdom and philosophy. Complete the mission of life. ..."Beethoven (1770-1827, German composer)"
 
Jump to:  


Related Topics
Subject Started by Replies Views Last post
Extracting Needed Class from Library?
Questions related to EJS
benkwang 1 6393 Last post May 07, 2008, 12:09:07 pm
by Fu-Kwun Hwang
Help needed - Feedback for simulations!
Collaborative Community of EJS
engrg1 4 4014 Last post April 24, 2012, 10:03:49 pm
by lookang
Powered by MySQL Powered by PHP Powered by SMF 1.1.13 | SMF © 2006-2011, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Page created in 5.056 seconds with 23 queries.since 2011/06/15