Work Done on Thermodynamic Path ABCA: 5625 J

  • Thread starter Thread starter keemosabi
  • Start date Start date
  • Tags Tags
    Thermodynamic Work
AI Thread Summary
The discussion revolves around calculating the work done during a thermodynamic process along the path ABCA, specifically from point C to A. The initial assumption is that the work can be determined by finding the area under the curve, interpreted as a trapezoid, resulting in a value of 5625 J. However, it is clarified that the sign of the work must be considered based on whether the gas is doing work or work is being done on the gas. Since the volume decreases during this segment, the work done by the gas is negative. The conversation emphasizes the importance of understanding the direction of work in thermodynamic calculations.
keemosabi
Messages
109
Reaction score
0

Homework Statement


The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 2.5 multiplied by 105 Pa, and the horizontal divisions represent 1.5 multiplied by 10-3 m3. Determine the work done (including algebraic sign) in each segment of the path.
cj6_p15-10alt.gif



(c) C to A
J

The Attempt at a Solution


Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?
 
Physics news on Phys.org
keemosabi said:

The Attempt at a Solution


Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?
Not quite. Is work being done by the gas or on the gas? What does this do to the sign of the area/work?

AM
 
Andrew Mason said:
Not quite. Is work being done by the gas or on the gas? What does this do to the sign of the area/work?

AM
Ahh. I see. Since the volume is decreasing the work done by the gas is negative.

Thank you for the help.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Trying to understand the logic behind adding vectors with an angle between them'

Thread 'Trying to understand the logic behind adding vectors with an angle between them'

My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
View full post »

Similar threads

Thermal efficiency of the engine in a PV diagram
Replies
2
Views
3K
Calculating Work Done in Baffling Thermodynamics Graph
Replies
5
Views
7K
Thermodynamics, find the work done from the graph
Replies
8
Views
5K
Why is the work done considered negative in this thermodynamics problem?
Replies
3
Views
1K
Work done in a thermodynamic process
Replies
3
Views
1K
Thermodynamic Cycle -- Work done as a function of Heat absorbed
Replies
3
Views
2K
How Is Heat Transferred in Different Paths of a P-V Diagram Cycle?
Replies
5
Views
6K
Work done by the force of a man on a crate of 80N
Replies
14
Views
6K
Thermal Efficiency of a Heat Engine based on pV-diagram
Replies
23
Views
12K
Thermodynamics cycle work question
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top