Calc 3- Triple Integral using cylindrical coordinates

In summary, the basic concepts of triple integrals using cylindrical coordinates involve using cylindrical coordinates instead of Cartesian coordinates to represent a three-dimensional volume. To convert a triple integral from Cartesian coordinates to cylindrical coordinates, transformations can be used and limits of integration need to be adjusted. The difference between a single, double, and triple integral is the dimensionality they represent. The advantages of using cylindrical coordinates include simplification and efficiency. To evaluate a triple integral using cylindrical coordinates, the integral must first be converted, limits of integration determined, and then evaluated using standard techniques while keeping in mind the extra factor of r in the integrand.
  • #1
krtica
50
0
Use cylindrical coordinates to evaluate the triple integral , sqrt(x^2+y^2) where the region integrated is the solid bounded by the circular paraboloid z=9-16(x^2+y^2) and the xy-plane.


I'm having trouble deciding what the bounds for r would be.
 
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  • #2
try drawing a cross section, say in the x-z plane

you should be able to find r as a function of z & the z bounds should be clear from the problem
 
  • #3
Thank you!
 
  • #4
no worries ;)
 

FAQ: Calc 3- Triple Integral using cylindrical coordinates

1. What are the basic concepts of triple integrals using cylindrical coordinates?

The basic concepts of triple integrals using cylindrical coordinates involve using cylindrical coordinates (r, θ, z) instead of Cartesian coordinates (x, y, z) to represent a three-dimensional volume. The integrand is also multiplied by an extra factor of r in the integral to account for the change in volume element.

2. How do you convert a triple integral from Cartesian coordinates to cylindrical coordinates?

To convert a triple integral from Cartesian coordinates to cylindrical coordinates, you can use the following transformations: x = r cos(θ), y = r sin(θ), and z = z. The limits of integration also need to be adjusted accordingly.

3. What is the difference between a single integral, double integral, and triple integral?

A single integral represents the area under a curve in one dimension. A double integral represents the volume under a surface in two dimensions. A triple integral represents the volume under a solid in three dimensions.

4. What are the advantages of using cylindrical coordinates in triple integrals?

Using cylindrical coordinates in triple integrals can simplify the integrand and the limits of integration. This can make the integration process easier and more efficient. Additionally, it is often more natural to use cylindrical coordinates when dealing with cylindrical or symmetric shapes.

5. How do you evaluate a triple integral using cylindrical coordinates?

To evaluate a triple integral using cylindrical coordinates, you can follow these steps: 1. Convert the integral to cylindrical coordinates. 2. Determine the limits of integration for each variable. 3. Evaluate the integral using standard techniques, such as Fubini's theorem or substitution. 4. Don't forget to include the extra factor of r in the integrand.

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