Understanding Work Done: A Bicycle Puncture Example

[Faiq]

How is in a bicycle puncture, the air flowing out of the puncture constitutes as an example for work done?

 

[Chestermiller]

How is in a bicycle puncture, the air flowing out of the puncture constitutes as an example for work done?

Work done on what by what?

 

[Faiq]

I also don't know that. The question was stated as "In which example is work done?" and this option is the correct answer

 

[Chestermiller]

I also don't know that. The question was stated as "In which example is work done?" and this option is the correct answer

Well the escaping air does work on the surrounding air in pushing it back. And the air still remaining in the tire does work on the air that it is pushing out ahead of it. So there are two places where work is being done.

 

[Faiq]

How is the still air pushing the escaping air out?

 

[Chestermiller]

How is the still air pushing the escaping air out?

The air remaining in the tire is expanding as it pushes the air ahead of it out. So it is not still air.

 

[Faiq]

Temperature has increased in this example (since the air is expanding)?

 

[Chestermiller]

Temperature has increased in this example (since the air is expanding)?

Temperature decreases in this example since the air is expanding.

 

[Faiq]

Oh yeah sorry got it