Hardcore rotation problem in multivariable calculus

In summary, the Cartesian equation for the torus formed by rotating the circle defined by (x-2)2+y2=1 along the y-axis is given by switching the x in the original equation with r=√(x2+z2) and simplifying. This is because any point (x,y,z) on the torus can also be represented by (√(x2+z2),y,0) on the original circle.
  • #1
Nikitin
735
27

Homework Statement


Let C be the circle defined by (x-2)2+y2 = 1. If this circle is rotated along the y-axis, a torus will form. What is the Cartesian equation for the torus?

The Attempt at a Solution



The solution manual says you just switch the x in (x-2)2+y2 = 1 with r=√(x2+z2) and simplify.Why would that work? Why does the x in the first equation equal the radius of the torus? I don't get it.
 
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  • #2
help?
 
  • #3
Hi Nikitin! :smile:

if (x,y,z) is on the torus, then so must be (√(x2+z2),y,0)

but that must be on the original circle, so (√(x2+z2) -2)2+y2 = 1 :wink:
 

Related to Hardcore rotation problem in multivariable calculus

1. What is a "hardcore rotation problem" in multivariable calculus?

A "hardcore rotation problem" in multivariable calculus refers to a specific type of problem that involves finding the rotation of a vector or object in three-dimensional space. It is considered "hardcore" because it requires a strong understanding of calculus concepts and techniques.

2. Why is the "hardcore rotation problem" important in scientific research?

The "hardcore rotation problem" is important in scientific research because it is a fundamental concept in physics and engineering. Many real-world problems, such as calculating the motion of objects or analyzing the behavior of fluids, require a thorough understanding of rotation in three-dimensional space.

3. How is the "hardcore rotation problem" solved in multivariable calculus?

The "hardcore rotation problem" is typically solved using vector calculus techniques, such as cross products, dot products, and partial derivatives. These techniques allow us to calculate the magnitude and direction of rotation for a given vector or object.

4. What are some common applications of the "hardcore rotation problem" in the real world?

The "hardcore rotation problem" has many applications in the real world, including in areas such as robotics, computer graphics, and fluid mechanics. For example, in robotics, understanding rotation is crucial for programming the movement of robotic arms and joints. In computer graphics, rotation is used to create three-dimensional animations and models. In fluid mechanics, rotation is essential for studying the flow of fluids in pipes and channels.

5. What are some tips for mastering the "hardcore rotation problem" in multivariable calculus?

To master the "hardcore rotation problem" in multivariable calculus, it is important to have a strong understanding of vector calculus and its applications. It is also helpful to practice solving a variety of rotation problems and to familiarize yourself with common techniques, such as using the right-hand rule and visualizing rotations in three-dimensional space. Additionally, seeking out resources such as textbooks, online tutorials, and practice problems can also aid in mastering this concept.

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