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Unformatted text preview: PHYS 153 Homework 6B Problem 1 A cylinder contains oxygen at a pressure of 2 . 00 atm. The volume is 4 . 00 L, and the temperature is 300 K. Assume that the oxygen may be treated as an ideal gas. The oxygen is carried through the following processes: Heated at constant pressure from the initial state (state 1) to state 2, which has T = 450 K. Cooled at constant volume to 250 K (state 3). Compressed at constant temperature to a volume of 4 . 00 L (state 4). Heated at constant volume to 300 K, which take the system back to state 1. (a) Show these four processes in a pV-diagram, giving the numerical values of p and V in each of the four states. (b) Calculate Q and W for each of the four processes. (c) Calculate the net work done by the oxygen. (d) What is the efficiency of this device as a heat engine? How does this compare to the efficiency of a Carnot-cycle engine operating between the same minimum and maximum temperatures of 250 K and 450 K?...
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This note was uploaded on 04/26/2009 for the course PHYS 153 taught by Professor Measday during the Winter '08 term at The University of British Columbia.
- Winter '08