Computing integral over a sphere

In summary, the conversation is about finding the integral of f(x,y,z) = x^2+y^2 over a sphere of radius 4 centered at the origin. The suggested solution involves using the parameters (p,θ,∅) for the sphere and performing a triple integral over dp, θ, and ∅. However, the boundaries for θ and ∅ are incorrect and the volume element is also incorrect.
  • #1
PsychonautQQ
784
10

Homework Statement


Computer the integral of f(x,y,z) = x^2+y^2 over the sphere S of radius 4 centered at the origin.


The Attempt at a Solution


so if the parameters for a sphere are in terms of (p,θ,∅)
,
triple integral (p^2((psin∅cosθ)^2+(psin∅sinθ)^2))dpdθd∅)

where the boundaries on dp is 0 to 4, and then dθ and d∅ are both 0 to 2∏

am I on the correct track here?
 
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  • #2
PsychonautQQ said:

Homework Statement


Computer the integral of f(x,y,z) = x^2+y^2 over the sphere S of radius 4 centered at the origin.


The Attempt at a Solution


so if the parameters for a sphere are in terms of (p,θ,∅)
,
triple integral (p^2((psin∅cosθ)^2+(psin∅sinθ)^2))dpdθd∅)

where the boundaries on dp is 0 to 4, and then dθ and d∅ are both 0 to 2∏

am I on the correct track here?

Your question doesn't make clear whether you are asked to do a surface integral over the surface of the sphere or a volume integral over the solid sphere. In either case, you wouldn't integrate both ##\phi## and ##\theta## from ##0## to ##2\pi##. Also, your volume element is incorrect.
 

What is a "Computing integral over a sphere"?

A "Computing integral over a sphere" refers to the process of calculating the value of an integral over a sphere, which involves finding the area under a curve on the surface of a sphere.

Why is computing an integral over a sphere important?

Computing an integral over a sphere is important in many fields of science, such as physics, engineering, and mathematics. It allows for the determination of important quantities, such as the volume, surface area, and mass distribution of a sphere.

What are the different methods for computing an integral over a sphere?

There are several methods for computing an integral over a sphere, including the spherical coordinates method, the Monte Carlo method, and the Gauss-Legendre method. Each method has its own advantages and is suitable for different types of integrals.

What are some applications of computing an integral over a sphere?

Computing an integral over a sphere is used in many applications, such as calculating the gravitational potential of a spherical mass distribution, finding the moment of inertia of a solid sphere, and determining the electric field around a charged sphere.

What are some challenges in computing an integral over a sphere?

One of the main challenges in computing an integral over a sphere is dealing with the singularity at the center of the sphere. This can be addressed by using appropriate mathematical techniques, such as regularization or singular value decomposition. Another challenge is determining the appropriate method for a given integral, as some methods may be more efficient or accurate for certain types of integrals.

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