How to Set Up a Surface Integral for Finding Average Value on a Unit Sphere?

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SUMMARY

The discussion focuses on calculating the average value of the function f(x,y,z) = xyz on the unit sphere within the first octant using surface integrals. The user identifies the need for a surface integral of the function over the sphere and recognizes the necessity of dividing by the surface area of the region. The conversation emphasizes the use of spherical coordinates, specifically addressing the challenge of setting up the integration correctly, particularly the formula for the surface area element in spherical coordinates.

PREREQUISITES
  • Understanding of surface integrals and their applications
  • Familiarity with spherical coordinates in multivariable calculus
  • Knowledge of calculating surface area on a sphere
  • Experience with triple and double integrals
NEXT STEPS
  • Research the formula for the surface area element in spherical coordinates, specifically dS
  • Study the process of converting triple integrals to double integrals for surface integrals
  • Learn how to set up and evaluate surface integrals over spherical surfaces
  • Explore examples of calculating average values of functions over surfaces
USEFUL FOR

Students studying multivariable calculus, particularly those focusing on surface integrals and spherical coordinates, as well as educators seeking to clarify these concepts for their students.

jacksonb62
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Homework Statement



Find the average value of the function f(x,y,z)=xyz on the unit sphere in the first octant

Homework Equations



I know that I need the surface integral of xyz over the sphere and then need to divide by the surface area of the region, but I'm having a hard time setting up the integration. We have always done surface integrals with double integrals, but for this I feel like spherical coordinates need to be used which I only know how to set up in a triple integral. Help please!

The Attempt at a Solution

 
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jacksonb62 said:

Homework Statement



Find the average value of the function f(x,y,z)=xyz on the unit sphere in the first octant

Homework Equations



I know that I need the surface integral of xyz over the sphere and then need to divide by the surface area of the region, but I'm having a hard time setting up the integration. We have always done surface integrals with double integrals, but for this I feel like spherical coordinates need to be used which I only know how to set up in a triple integral. Help please!

The Attempt at a Solution


Spherical coordinates with ##\rho## constant will only have two variables, giving a double integral. What is the formula for the element of surface area in spherical coordinates? ##dS = ??##.
 

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