Parametric representation of paraboloid cylinder

In summary, for the equation z = y^3, the r(u,v) formula can be simplified to [u, v, v^3], but for more complex equations, there may not be a specific formula and one may need to get creative in determining r(u,v).
  • #1
geft
148
0
The equation is z = y^3. I know how to do normal planes and spheres, but I don't know what to set for r(u,v) when it comes to paraboloid cylinders.
 
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  • #2
geft said:
The equation is z = y^3. I know how to do normal planes and spheres, but I don't know what to set for r(u,v) when it comes to paraboloid cylinders.

Since x can be anything, make it one of your variables (either u, or v).
 
  • #3
x = u
y = v
z = v^3

r(u, v) = [u, v, v^3]?

Is there a formula for the r(u, v)?
 
  • #4
geft said:
x = u
y = v
z = v^3

r(u, v) = [u, v, v^3]?

Is there a formula for the r(u, v)?

If you're asking if there is a formulaic method for determining what r(u,v) should be, then the answer is "sorta". In the case of something along the lines of z(x,y) then you let u and v be x and y, and then just have the function as your z parameter. However you don't always get things defined by functions like that, in which case you need to get a little creative. Either re-arranging things, or even jumping coordinate systems to make stuff easier.
 

1. What is a paraboloid cylinder?

A paraboloid cylinder is a three-dimensional shape that resembles a cylinder with a parabolic cross section. It is formed by taking a parabola and rotating it around its axis, creating a curved surface that extends infinitely in both directions.

2. How is a paraboloid cylinder represented parametrically?

A paraboloid cylinder can be represented parametrically using two parameters, u and v, which represent the angle of rotation and the distance from the axis, respectively. The parametric equations for a paraboloid cylinder are x = v*cos(u), y = v*sin(u), and z = v^2.

3. What is the advantage of using parametric representation for a paraboloid cylinder?

The advantage of using parametric representation for a paraboloid cylinder is that it allows for a more flexible and precise description of the shape, compared to using standard equations or geometric formulas. It also allows for easy manipulation of the shape and its parameters.

4. How is a paraboloid cylinder different from a parabolic cylinder?

A paraboloid cylinder and a parabolic cylinder are both three-dimensional shapes with a parabolic cross section, but they differ in their overall shape. A paraboloid cylinder has a curved surface that extends infinitely in both directions, while a parabolic cylinder is a finite shape with flat circular faces.

5. What are some real-life applications of paraboloid cylinders?

Paraboloid cylinders have many practical applications, such as in the design of satellite dishes, reflector antennas, and parabolic mirrors for solar energy collection. They are also used in architecture for creating unique building designs and in engineering for creating curved surfaces in various structures.

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