Math Problem Statement

Set up, but do not evaluate, an integral for the volume of the solid obtained by rotating the region bounded by the curves y = x^3, y = 0, x = 1, about x = 2.

Solution

The problem asks to set up (but not evaluate) an integral for the volume of the solid obtained by rotating the region bounded by the curves y=x3y = x^3, y=0y = 0, x=1x = 1, and rotating about the line x=2x = 2.

Step-by-step solution:

  1. Identify the method to use:

    • Since we are rotating about a vertical line x=2x = 2, we use the shell method.

    The shell method formula is: V=2πab(radius)(height)dxV = 2\pi \int_{a}^{b} ( \text{radius} )(\text{height}) \, dx

  2. Radius of the shell:

    • The radius is the distance from the curve x=2x = 2 to the current xx-coordinate.
    • This distance is 2x2 - x.
  3. Height of the shell:

    • The height is the value of the function y=x3y = x^3, which is just x3x^3.
  4. Bounds of integration:

    • The region is bounded by x=0x = 0 and x=1x = 1, so these will be the limits of integration.
  5. Setting up the integral: V=2π01(2x)(x3)dxV = 2\pi \int_{0}^{1} (2 - x)(x^3) \, dx

This is the required integral to compute the volume of the solid obtained by rotating the region around the line x=2x = 2.

Would you like further details or have any questions?

Related Questions:

  1. What is the shell method, and when is it used instead of the disk/washer method?
  2. How would the setup change if we were rotating about the yy-axis instead of x=2x = 2?
  3. How would we compute the volume if we used the disk/washer method (if applicable)?
  4. What would be the integral setup if the function were y=x2y = x^2 instead of y=x3y = x^3?
  5. How does the choice of the axis of rotation affect the integral setup?

Tip:

Always double-check the axis of rotation and whether the shell or disk method is more appropriate based on the problem's geometry.

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Math Problem Analysis

Mathematical Concepts

Calculus
Volume of Solids of Revolution
Shell Method

Formulas

V = 2π ∫[a,b] (radius)(height) dx

Theorems

Volume by Shell Method

Suitable Grade Level

Undergraduate Calculus (Calculus I or II)