E115_Problem_Set_3

# E115_Problem_Set_3 - q w and Δ U Justify your answers 5...

This preview shows page 1. Sign up to view the full content.

e 115 Engineering Thermodynamics Fall 2009 University of California Problem set 3 Due: Wednesday, September 9 th , in lecture 1. (30 points) One mole of an ideal monatomic gas, initially at 273K and at a pressure of one atmosphere is contained in a chamber that permits controlled variation of its state. Controlled quantities of heat and work are supplied to the system so that its pressure and volume change along a path specified by the equation: V liters ( ) = a liters atm 2 P 2 ( atm 2 ) where a is a constant. Assume that the process is carried out reversibly, and that the final pressure of the system is 0.5 atm. a) Plot the process path, and determine the signs of
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: q , w , and Δ U . Justify your answers. ( 5 points ) b) Using the first law, and simplifications appropriate to an ideal monatomic gas, determine the values of q , w , and Δ U. ( 10 points ) c) Instead of using the approach in part b), now compute the heat that needs to be supplied or removed to take the system to a final pressure of 0.5 atm by developing an appropriate expression for TdS , and integrating. ( 15 points ) Hint : For a reversible process, we may write dU = δ q rev − w rev = TdS − PdV q rev = TdS = dU + PdV...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online