Contents ...Lecture 26 Laws of T mics- Nov 30 PV Graphs and a Cycle Timer Notes

Question

Contents ...Lecture 26 Laws of T mics- Nov 30 PV Graphs and a Cycle Timer Notes Evaluate Feedback-Print PV Graphs and a Cycle Due this Thursday, Nov 30 at 01:15 pm (EST) The state of an ideal gas can be represented by a point on a PV (pressure volume) diagram. If you know the quantity of gas, n, a unique point in pressure (P) and volume (V) can be used to determine a temperature (T). Each point on a PV diagram also has a single internal energy (U) assigned to it. If a process starts at a point and returns to that same point on a PV diagram, it returns to the same P, T, and U. The PV diagram below shows four different states, A, B, C, and D. The lines connecting the states represent processes or transitions. For example, the line connecting states A and B represe ansion of the gas (transition to larger volume) while the pressure is kept constant. In the case of this diagram, the pressure at states A and B is 5.09os Pa. The pressure at states C an 2.24x105 pa. Likewise the volume at states A and D is 2.02x 10-3 m and the volume at states B and C is 5.05x10-3 m What type of process is the transition from state 8 to C (transition Bc)7 Correct: isochoric

Explanation / Answer

B to C : constant volume so isochoric process.

Work done = 0

A to B:

Isobaric process

W = p deltaV = (5.09 x 10^5) (5.05 - 2.02) x 10^-3

= 1542.27 J

CD:  

W = (2.24 x 10^5) (2.02 - 5.05) x 10^-3

= - 678.7 J

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