## Thermodynamics B/C

Test your knowledge of various Science Olympiad events.
MattChina
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### Re: Thermodynamics B/C

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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Justin72835
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### Re: Thermodynamics B/C

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.
"The fault, dear Brutus, is not in our stars,
But in ourselves, that we are underlings."

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UTF-8 U+6211 U+662F
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### Re: Thermodynamics B/C

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

MattChina
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### Re: Thermodynamics B/C

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

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

Anyways, great job to both of you and sorry for the confusion! I think it's MattChina's turn now.
"The fault, dear Brutus, is not in our stars,
But in ourselves, that we are underlings."

University of Texas at Austin '23
Seven Lakes High School '19

MattChina
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### Re: Thermodynamics B/C

Lets do this. What is the best way to increase the efficiency of a carnot engine?
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Justin72835
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### Re: Thermodynamics B/C

Lets do this. What is the best way to increase the efficiency of a carnot engine?
$e=1-\frac{Tc}{Th}$
"The fault, dear Brutus, is not in our stars,
But in ourselves, that we are underlings."

University of Texas at Austin '23
Seven Lakes High School '19

UTF-8 U+6211 U+662F
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Joined: January 18th, 2015, 7:42 am
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### Re: Thermodynamics B/C

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

Justin72835
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Posts: 175
Joined: June 25th, 2017, 7:06 am
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### Re: Thermodynamics B/C

Lets do this. What is the best way to increase the efficiency of a carnot engine?
$e=1-\frac{Tc}{Th}$
Increase the ratio of hot temperature to cold temperature
Oh, I completely misread that question.
"The fault, dear Brutus, is not in our stars,
But in ourselves, that we are underlings."

University of Texas at Austin '23
Seven Lakes High School '19

MattChina
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Joined: February 12th, 2017, 8:06 am
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### Re: Thermodynamics B/C

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