Triple Integration for Volume: Finding Intersections and Sketching Functions

In summary, the conversation discusses finding the triple integral to determine the volume of a region bounded by two paraboloids. It is suggested to sketch the volume and determine the boundaries before finding the intersection and projecting it onto the xy-plane. The use of graphing calculators is not allowed and alternative methods for sketching and finding the intersection are requested.
  • #1
Tarhead
7
0
I have a group of problems that deals with the equations:

f(x,y)= x^2+y^2
g(x,y)=20-(x-4)^2-(y+2)^2

Can someone help find the triple integral to find the volume.
 
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  • #2
I would start off by making at the very least a rough sketch of the volume you are trying to find, that way you can find out the boundaries you are dealing with.
 
  • #3
It might help to clarify the problem: functions don't HAVE a volume!

If you mean "find the volume of the region bounded by z= x2+ y2 (a paraboloid) and z= 20- (x-4)2- (y+2)2 (also a paraboloid)" then you need to determine where the two paraboloids intersect and "project" that down to the xy-plane.

I get (x+2)2+ (y-1)2= 5, a circle. Subtract the two "z" values and integrate over that circle.

(Please do not post the same question twice!)
 
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  • #4
Thanks for the help. I have problems with finding the intersection and projecting that on the x-y plane. We cannot use graphing calculators. Are there any easy ways to sketch the functions and/or find the intersection?
 

Related to Triple Integration for Volume: Finding Intersections and Sketching Functions

1. What is triple integration for volume?

Triple integration for volume is a mathematical technique used to calculate the volume of a three-dimensional shape. It involves integrating a function over three variables, typically x, y, and z, within a specific region in space.

2. When is triple integration for volume used?

Triple integration for volume is used in various scientific fields, such as physics, engineering, and mathematics, to determine the volume of complex shapes and objects. It is also commonly used in computer graphics to render three-dimensional images.

3. How is triple integration for volume calculated?

To calculate the volume using triple integration, you first need to define the region in space and set up the integral using the limits of each variable. Then, you integrate the function with respect to each variable, starting from the innermost integral and working your way out.

4. What are some common applications of triple integration for volume?

Triple integration for volume is used in various real-world applications, such as calculating the volume of a solid object, finding the mass of an object with varying density, and determining the center of mass of a three-dimensional object.

5. Are there any limitations to using triple integration for volume?

While triple integration for volume is a powerful tool, it can be challenging to set up the integral and evaluate it, especially for complex shapes. It also assumes that the object being evaluated has a continuous volume, which may not always be the case in the real world.

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