Work to pump out air from cylinder

[Stefan]

Homework Statement

[/B]
I know only the length (l) and cross-section area (S) of an air tank, cylinder. The question is how much work is needed to pump out air from the cylinder.

Homework Equations

The Attempt at a Solution

Is it correct to use here the formula
W = pV?
The initial pressure isn't defined in the content of the task, so I am also wondering if I can use as it the atmospheric pressure.

 

[Nidum]

What do you mean by cylinder ?

An air tank or the working cylinder of an air pump ?

 

[Stefan]

Air tank.

 

[rude man]

Homework Statement

I know only the length (l) and cross-section area (S) of an air tank, cylinder. The question is how much work is needed to pump out air from the cylinder.

Homework Equations

3. The Attempt at a Solution [/B]
Is it correct to use here the formula
W = pV?
The initial pressure isn't defined in the content of the task, so I am also wondering if I can use as it the atmospheric pressure.

There may be more than one answer to this question, but the method I have in mind would definitely agree with your answer: Work = pV, V = Sl, p = 1 at.