What is the volume enclosed by the parabolic cylinder and two planes?

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SUMMARY

The volume enclosed by the parabolic cylinder defined by the equation y = 10 - a²x² and the planes z = y and z = 2 - y requires careful consideration of the boundaries. The discussion clarifies that for a constant a > 0, specifically using a = 2, the correct interpretation of the surfaces is crucial to avoid calculating an infinite volume. The solution involves separating the volume into two integrals based on the intersection of the planes and the cylinder, ensuring a closed solid is defined for accurate volume computation.

PREREQUISITES
  • Understanding of parabolic equations, specifically y = 10 - a²x².
  • Familiarity with triple integrals and volume calculations in calculus.
  • Knowledge of graphing techniques using tools like Maple.
  • Basic principles of solid geometry and bounded regions.
NEXT STEPS
  • Study the method of separating integrals for volume calculations in multivariable calculus.
  • Learn how to graph and analyze surfaces using Maple for better visualization.
  • Explore the concept of bounded solids and conditions for closed volumes in calculus.
  • Investigate the implications of varying the parameter a in the equation y = 10 - a²x² on the volume calculation.
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Students in calculus courses, particularly those studying multivariable calculus, as well as educators and tutors looking for examples of volume calculations involving parabolic cylinders and planes.

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Homework Statement



Find the volume of the solid enclosed by the parabolic cylinder y=10 - a2x2 and the planes z=y and z=2-y, where a > 0 is a constant.

Homework Equations


I have graphed the 3 surfaces on Maple to visualize the solid enclosed by these surfaces but the problem is there is no closed solid. There is not one single closed solid formed so I really don't know which volume we are looking for. Computing the volume of an unclosed solid would give me an infinite volume, which I am sure is not what the question asks. Can someone please help me?

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using a =2
 
Last edited:
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i think maybe you have graphed z=10 - a^2y^2, rather than y=10 - a^2x^2
 
then you will need to separate into 2 integrals, depending on which plane is the bound
 

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