Triple Integrals: Evaluating ∫∫∫6xydV

In summary, the region for the given triple integral is defined by the following limits: z is evaluated from 0 to 1+x+y, y is evaluated from √x to 0, and x is evaluated from 0 to 1. The limit for y may have been incorrectly assumed to be -1-x instead of 0 due to confusion between the projection of z = 1+x+y on the xy plane and the curve y = √x.
  • #1
bodensee9
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Homework Statement



Can someone see if I have set this up correctly? So I am to evaluate ∫∫∫6xydV. The region lies between z = 1+x+y and above the region in the xy plane bounded by the curves y = √x, y = 0, x = 1.
So, would this be equal to ∫∫∫6xydzdydx, where z is evaluated from 0 to 1+x+y, y is evaluated from √x to -1-x, and x is evaluated from 0 to 1? Thanks!


Homework Equations





The Attempt at a Solution

 
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  • #2
Your limits for z and x looks fine, but why do you think y goes from [itex]\sqrt{x}[/itex] to [itex]-x-1[/itex]? Where do you get that last mentioned limit for y?
 
  • #3
I guess because that's where the projection of z = 1+x+y on the xy plane intersects the curve y = √x. so i thought y would range between √x and -1 - x. Thanks.
 

1. What is a triple integral?

A triple integral is a mathematical tool used in calculus to solve problems involving three-dimensional objects or functions. It involves integrating a function over a three-dimensional region in space.

2. How is a triple integral evaluated?

To evaluate a triple integral, you must first determine the limits of integration for each variable (x, y, and z). Then, use the appropriate integration techniques to solve the integral in the order of dz, dy, and dx. This means that you will integrate first with respect to z, then y, and finally x.

3. What are the applications of triple integrals?

Triple integrals have various applications in physics, engineering, and other fields. They can be used to calculate volumes, surface areas, and moments of inertia for three-dimensional objects. They are also used in fields such as fluid mechanics, electromagnetism, and thermodynamics.

4. Can triple integrals be evaluated using any coordinate system?

Yes, triple integrals can be evaluated using different coordinate systems, such as rectangular, cylindrical, and spherical coordinates. The choice of coordinate system depends on the problem and can make the evaluation of the integral easier.

5. What is the significance of the constant 6 in the triple integral ∫∫∫6xydV?

The constant 6 in the triple integral represents the value of the function being integrated. In this case, it is a constant value of 6, meaning that the value of the function is the same throughout the region being integrated. It is often used to represent the density of a three-dimensional object or function.

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