Finite area with infinite volume

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SUMMARY

The discussion centers on the mathematical concept of finite area versus infinite volume, specifically referencing Torricelli's trumpet, which demonstrates that the function f(x) = 1/x has an infinite area from 1 to infinity but yields a finite volume when rotated around the x-axis. The user seeks assistance in identifying an infinite region with a finite area that, when rotated around the y-axis, produces an infinite volume. Additionally, they inquire about proving that rotating a finite area around the y-axis results in a finite volume, indicating this is part of their assignment.

PREREQUISITES
  • Understanding of calculus, particularly integration techniques.
  • Familiarity with the concept of volume of revolution.
  • Knowledge of the properties of functions and their graphs.
  • Basic understanding of limits and infinite series.
NEXT STEPS
  • Research the properties of Torricelli's trumpet and its implications in calculus.
  • Explore the method of cylindrical shells for calculating volumes of revolution.
  • Investigate the relationship between area and volume in the context of infinite regions.
  • Study examples of functions that yield finite areas but infinite volumes when rotated.
USEFUL FOR

Students studying calculus, mathematicians interested in geometric properties, and educators looking for examples of finite area and infinite volume concepts.

tangur
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I know that f(x)= 1/x has a infinite area from 1 to infinity but if this area is roated about the x-axis it gives a finite volume. It's actually Torricelli's trumpet.

However, I can't think of any infinite region with a finite area that when rotated about the y-axis gives an infinite volume.

Any help is welcome.

Thanks
 
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In light of that, have you thought about trying to prove that rotating a finite area around the y-axis always yields a finite volume?
 
How would you suggest that I try proving that an infinite region which holds a finite area, always gives a finite volume when rotated around the y-axis.

To be honest it is a question on my assignment, so I'm thinking there has to be an answer for it.

Any hints are accepted
 

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