Cooking Gas Containers: Temp Impact of Motion

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Homework Help Overview

The discussion revolves around the impact of motion on the temperature of gas molecules inside cooking gas containers in a moving lorry. The subject area is thermodynamics, specifically the relationship between temperature and kinetic energy of gas molecules.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand whether the temperature of gas molecules changes when the lorry is in motion. Some participants question the relevance of kinetic energy relative to the center of mass versus a fixed point.

Discussion Status

Participants are exploring the implications of motion on temperature, with some guidance provided regarding the definition of temperature in relation to kinetic energy. There is an ongoing examination of scenarios involving both uniform motion and acceleration.

Contextual Notes

There is a focus on the distinction between kinetic energy relative to the center of mass and kinetic energy relative to an external observer. The discussion also touches on the implications of acceleration on temperature, though no definitive resolution has been reached.

erisedk
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Homework Statement


Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside the containers will increase, decrease or stay the same?

Homework Equations


T is proportional to KE of gas molecules.

The Attempt at a Solution


I thought it would increase, because the average KE of the gas molecules would increase. But the answer says stays the same.
 
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Hi erisedk:

I think you forgot that temperature is a measure of the average kinetic energy (KE) with respect to the center of mass of the material. Although the KE is increased with respect to a fixed point on the ground, that increase is irrelevant to temperature.

Regards,
Buzz
 
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Thank you, I definitely don't think I even knew that. If the car were accelerating, would the temperature still not change because the increase in velocity would occur for the centre of mass as well?
 
erisedk said:
If the car were accelerating, would the temperature still not change because the increase in velocity would occur for the centre of mass as well?
Hi erisedk:

Temperature does not include the KE of the center of mass (COM). It is the proportional to the average of the KE of the particles relative to the COM. That is, for each particle its
KE = 1/2 mv2
where v is the velocity of the particle relative to the systems COM.

Regards,
Buzz
 
Oh yeah, I got that. So even if it were accelerating, no change in temperature right?
 
Hi erisedk:

Right.

Regards,
Buzz
 
Thank you :)
 
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