Thermodynamics B/C

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Re: Thermodynamics B/C

Postby MattChina » April 4th, 2018, 7:05 am

Two gases occupy two containers, A and B. The gas in A, of volume 0.14 cubic meters, exerts a pressure of 1.18 MPa. The gas in B, of volume 0.21 cubic meters, exerts a pressure of 0.82 MPa. The containers are united by a tube of negligible volume and the gases are allowed to intermingle. What is the final pressure in the container if the temperature remains constant?
0.964?
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Re: Thermodynamics B/C

Postby Justin72835 » April 4th, 2018, 6:51 pm

Two gases occupy two containers, A and B. The gas in A, of volume 0.14 cubic meters, exerts a pressure of 1.18 MPa. The gas in B, of volume 0.21 cubic meters, exerts a pressure of 0.82 MPa. The containers are united by a tube of negligible volume and the gases are allowed to intermingle. What is the final pressure in the container if the temperature remains constant?
0.964?
Not quite. How did you get your answer?

EDIT: This answer is actually correct.
Last edited by Justin72835 on April 4th, 2018, 7:18 pm, edited 1 time in total.
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Re: Thermodynamics B/C

Postby UTF-8 U+6211 U+662F » April 4th, 2018, 7:05 pm

Two gases occupy two containers, A and B. The gas in A, of volume 0.14 cubic meters, exerts a pressure of 1.18 MPa. The gas in B, of volume 0.21 cubic meters, exerts a pressure of 0.82 MPa. The containers are united by a tube of negligible volume and the gases are allowed to intermingle. What is the final pressure in the container if the temperature remains constant?
0.964?
Not quite. How did you get your answer?
Using the law of partial pressures 1.18 MPa * (0.14/0.35) + 0.82 MPa * (0.21/0.35) = 0.964 MPa

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Re: Thermodynamics B/C

Postby MattChina » April 4th, 2018, 7:08 pm

Two gases occupy two containers, A and B. The gas in A, of volume 0.14 cubic meters, exerts a pressure of 1.18 MPa. The gas in B, of volume 0.21 cubic meters, exerts a pressure of 0.82 MPa. The containers are united by a tube of negligible volume and the gases are allowed to intermingle. What is the final pressure in the container if the temperature remains constant?
0.964?
Not quite. How did you get your answer?

(P1V1/Vf)+(P2V2/Vf)
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Justin72835
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Re: Thermodynamics B/C

Postby Justin72835 » April 4th, 2018, 7:22 pm

Nevermind, both of you (UTF-8 U+6211 U+662F and MattChina) are right. I messed up my calculations beforehand :cry:

Anyways, great job to both of you and sorry for the confusion! I think it's MattChina's turn now.
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Re: Thermodynamics B/C

Postby MattChina » April 4th, 2018, 7:38 pm

Lets do this. What is the best way to increase the efficiency of a carnot engine?
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Re: Thermodynamics B/C

Postby Justin72835 » April 5th, 2018, 4:20 pm

Lets do this. What is the best way to increase the efficiency of a carnot engine?
[math]e=1-\frac{Tc}{Th}[/math]
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Re: Thermodynamics B/C

Postby UTF-8 U+6211 U+662F » April 6th, 2018, 7:32 pm

Lets do this. What is the best way to increase the efficiency of a carnot engine?
[math]e=1-\frac{Tc}{Th}[/math]
Increase the ratio of hot temperature to cold temperature

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Re: Thermodynamics B/C

Postby Justin72835 » April 6th, 2018, 7:40 pm

Lets do this. What is the best way to increase the efficiency of a carnot engine?
[math]e=1-\frac{Tc}{Th}[/math]
Increase the ratio of hot temperature to cold temperature
Oh, I completely misread that question. :(
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Re: Thermodynamics B/C

Postby MattChina » April 7th, 2018, 7:59 am

Lets do this. What is the best way to increase the efficiency of a carnot engine?
[math]e=1-\frac{Tc}{Th}[/math]
Increase the ratio of hot temperature to cold temperature
correct. your turn
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