Closed Systems

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Emily Lo 1J
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Joined: Thu Sep 19, 2019 12:16 am

Closed Systems

Postby Emily Lo 1J » Sun Feb 02, 2020 2:52 pm

How can you change the energy in a closed system? And does it differ with isolated systems?

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

Re: Closed Systems

Postby KBELTRAMI_1E » Sun Feb 02, 2020 2:58 pm

Emily Lo 1J wrote:How can you change the energy in a closed system? And does it differ with isolated systems?


Quoting this because I want to see the replies that it gets :)

JonathanS 1H
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Joined: Thu Jul 11, 2019 12:17 am

Re: Closed Systems

Postby JonathanS 1H » Sun Feb 02, 2020 3:01 pm

In a closed system, you can change the energy by adding heat and/or doing work on the system. I am less certain with the isolated system, but I am pretty sure there should be no net change in the total energy of the system.

Dan M -3E
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Joined: Wed Sep 18, 2019 12:19 am

Re: Closed Systems

Postby Dan M -3E » Sun Feb 02, 2020 3:03 pm

On a closed system, you can add energy by adding it to the entire system, which is different from an open system where you can pick where to add work/energy, or an isolated system where you can't add energy, I think.

Timmy Nguyen Dis 1I
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Joined: Sat Aug 17, 2019 12:17 am

Re: Closed Systems

Postby Timmy Nguyen Dis 1I » Sun Feb 02, 2020 4:02 pm

In a closed system, pressure can be applied.

Eva Zhao 4I
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Joined: Sun Sep 29, 2019 12:16 am

Re: Closed Systems

Postby Eva Zhao 4I » Mon Feb 03, 2020 1:22 pm

In a closed system, energy can be exchanged with surroundings, unlike an isolated system in which nothing can be exchanged with the surroundings. The energy of a closed system can be changed by heating/cooling or compression/expansion (i.e. compressing a piston).

Shail Avasthi 2C
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Joined: Fri Aug 30, 2019 12:17 am

Re: Closed Systems

Postby Shail Avasthi 2C » Mon Feb 03, 2020 5:30 pm

ΔU = q + w, so to change the energy of a closed system, you would heat it or do work on it.

005162902
Posts: 102
Joined: Wed Sep 18, 2019 12:15 am

Re: Closed Systems

Postby 005162902 » Mon Feb 03, 2020 5:36 pm

KBELTRAMI_1E wrote:
Emily Lo 1J wrote:How can you change the energy in a closed system? And does it differ with isolated systems?


Quoting this because I want to see the replies that it gets :)


I would assume you would add heat to change energy since the system is isolated.

Chris Charton 1B
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Joined: Mon Jun 17, 2019 7:23 am

Re: Closed Systems

Postby Chris Charton 1B » Mon Feb 03, 2020 6:13 pm

An example of changing energy of a closed system would be adding or removing heat, or compression/expansion. An isolated system cannot transfer energy with its environment.

Jainam Shah 4I
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Joined: Fri Aug 30, 2019 12:16 am

Re: Closed Systems

Postby Jainam Shah 4I » Mon Feb 03, 2020 7:30 pm

Heat transfer can occur in a closed system or work can be done via compression/expansion. We cannot add any substance in the system, but heat transfer can occur between the system and surroundings. Think of a cold ice pack as a closed system.
Last edited by Jainam Shah 4I on Mon Feb 03, 2020 9:41 pm, edited 1 time in total.

Sally Qiu 2E
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Joined: Fri Aug 30, 2019 12:18 am

Re: Closed Systems

Postby Sally Qiu 2E » Mon Feb 03, 2020 7:56 pm

in a closed system, you can change the energy by doing work/having work done on the system or by changing the temperature

Jack Riley 4f
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Joined: Sat Aug 24, 2019 12:17 am

Re: Closed Systems

Postby Jack Riley 4f » Mon Feb 03, 2020 7:56 pm

deltaU = q + w so you can change it by adding heat or doing work

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

Re: Closed Systems

Postby KBELTRAMI_1E » Fri Mar 13, 2020 10:05 am

Eva Zhao 4I wrote:In a closed system, energy can be exchanged with surroundings, unlike an isolated system in which nothing can be exchanged with the surroundings. The energy of a closed system can be changed by heating/cooling or compression/expansion (i.e. compressing a piston).


very helpful!

kevinolvera1j
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Joined: Fri Aug 02, 2019 12:15 am

Re: Closed Systems

Postby kevinolvera1j » Fri Mar 13, 2020 2:54 pm

A closed system means that the system is closed off from exchanging mass with its surroundings but it can exchange energy. An isolated system cannot exchange either. Energy can be introduced into a closed system either through heat or work (increasing pressure).

Ryan Yee 1J
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Joined: Sat Aug 17, 2019 12:16 am

Re: Closed Systems

Postby Ryan Yee 1J » Fri Mar 13, 2020 3:09 pm

In a closed system, energy can be exchanged in and out of the system, but matter can't. So by adding or removing heat, you can change the energy in the system. In an isolated system, nothing can be exchanged and there isn't a way to change the energy within the system.


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