What's is dv for a finite cylinder?

[charlies1902]

For an infinite cylinder dV=2*pi*r*L*dr
Would dv=pi*L*r*dr for a finite cylinder?

 

[NascentOxygen]

For an infinite cylinder dV=2*pi*r*L*dr

Explain this in words, to show that you understand it and how it arises.

 

[danielakkerma]

Yes, this definitely still holds;
I could also refer you here, for the proof:http://en.wikipedia.org/wiki/Cylinder_(geometry)#Volume"
Beware that an infinite cylinder carries, A volume per unit length, or, L is unknown...
Both formulae are correct and useable...