Undergrad Why can an infinite area have a finite volume or SA?

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SUMMARY

The discussion centers on the mathematical concept of shapes with infinite surface areas but finite volumes, specifically referencing Gabriel's Horn. The example of a cube is used to illustrate how removing an infinite sequence of slices can result in an infinite surface area while maintaining the same volume. This paradox is a key topic in calculus, particularly relevant for students preparing for exams in calculus 2.

PREREQUISITES
  • Understanding of calculus concepts, particularly limits and infinite series.
  • Familiarity with geometric shapes and their properties, such as volume and surface area.
  • Knowledge of mathematical paradoxes, specifically Gabriel's Horn.
  • Basic skills in visualizing three-dimensional shapes and their transformations.
NEXT STEPS
  • Research the properties of Gabriel's Horn and its implications in calculus.
  • Study the concept of limits in calculus to understand how infinite sequences behave.
  • Explore examples of other shapes with finite volumes and infinite surface areas.
  • Learn about the applications of these concepts in real-world scenarios, such as physics and engineering.
USEFUL FOR

Students preparing for calculus exams, educators teaching advanced mathematics, and anyone interested in the paradoxes of geometry and calculus.

Zack K
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I have a calculus 2 midterm coming up and given the exam review questions, this seems like this question can potentially be on it.

I've tried to look it up, but I always find the famous painters example, which I don't find satisfying.
 
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Zack K said:
I have a calculus 2 midterm coming up and given the exam review questions, this seems like this question can potentially be on it.

I've tried to look it up, but I always find the famous painters example, which I don't find satisfying.

If you think of a cube, you can imagine it as a stack of an infinite number of square surfaces. So, there already is an infinite surface in there, so to speak. A simple way to generate an infinite surface area is simply to remove an infinite sequence of slices: if the cube is 1 unit high, you could remove the slices at ##z = 1/2, 1/3, 1/4 \dots##.

This would leave a shape with actually the same volume as before, but an infinite surface area.
 
Relativistic Momentum, Mass, and Energy Momentum and mass (...), the classic equations for conserving momentum and energy are not adequate for the analysis of high-speed collisions. (...) The momentum of a particle moving with velocity ##v## is given by $$p=\cfrac{mv}{\sqrt{1-(v^2/c^2)}}\qquad{R-10}$$ ENERGY In relativistic mechanics, as in classic mechanics, the net force on a particle is equal to the time rate of change of the momentum of the particle. Considering one-dimensional...

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