Math Problem Statement
Find the volume of the resulting solid if the region under the curve y= 3/ (x^2 + 3x + 2) from x= 0 to x = 1 is rotated about the x-axis and the y-axis
Solution
To find the volume of the solid generated when the region under the curve is rotated about both the x-axis and the y-axis, we'll approach the problem in two parts:
1. Volume of Solid by Rotation about the x-axis (using the Disk Method)
The formula for the volume of a solid obtained by rotating a curve around the x-axis is:
For the given curve and the limits to , we first square the function and then integrate it:
2. Volume of Solid by Rotation about the y-axis (using the Shell Method)
The formula for the volume of a solid obtained by rotating a curve around the y-axis is:
Here, the limits are also to , and , so the integral becomes:
I'll now calculate both volumes using these formulas.
The volumes of the solids obtained by rotating the given curve about the x-axis and y-axis are as follows:
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Volume of the solid when rotated about the x-axis:
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Volume of the solid when rotated about the y-axis:
If you'd like further details or to simplify these expressions, feel free to ask!
Here are five follow-up questions you might explore:
- How do we interpret the result if the curve is rotated around other axes?
- What is the significance of the logarithmic terms in the volume formula?
- Can the method be extended to non-polynomial functions?
- How would the volume change if the limits of integration were extended?
- How does the shell method compare with the disk method for other types of curves?
Tip: For problems involving volume of revolution, always check if the problem asks for rotation around a specific axis, as the method (disk or shell) depends on this choice.
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Math Problem Analysis
Mathematical Concepts
Integral Calculus
Volume of Solids of Revolution
Disk Method
Shell Method
Formulas
Volume by rotation around the x-axis: V_x = π ∫[a,b] [f(x)]^2 dx
Volume by rotation around the y-axis: V_y = 2π ∫[a,b] x f(x) dx
Theorems
Disk Method Theorem
Shell Method Theorem
Suitable Grade Level
Grades 11-12, College-level Calculus
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