Math Problem Statement
Solution
To solve this problem, we will use the method of cylindrical shells. We are rotating the region in the first quadrant bounded by the curves , , , about the line .
Step-by-step solution:
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Understanding the region:
- The curve and the line bound the region, with as the left boundary. We are rotating around the horizontal line .
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Set up the volume integral using cylindrical shells:
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For a solid generated by rotating about a horizontal line, the height of each shell is based on the -coordinate of the boundary, and the radius of the shell is the vertical distance from the line of rotation.
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The radius of the shell is (since the rotation is about ).
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The height of the shell is determined by the boundary curve .
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The volume of a cylindrical shell is given by: So, the volume element is:
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Determine limits of integration:
- The region is bounded by and .
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Set up and compute the integral: The total volume is: We can now solve this integral step by step.
Let's proceed to compute the integral.The volume of the solid obtained by rotating the region around the line is .
Would you like further details or have any other questions?
Here are five related questions for deeper understanding:
- How would the solution change if the region were rotated around the -axis?
- What happens if we rotate the region around a different horizontal line, such as ?
- Can this problem be solved using the disk/washer method instead of cylindrical shells?
- What is the volume if the curve is replaced with another function, such as ?
- How would the limits of integration change if the region extended into negative -values?
Tip: The method of cylindrical shells is often useful when the axis of rotation is parallel to the boundaries of the region you're integrating.
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Math Problem Analysis
Mathematical Concepts
Calculus
Volume of Solids of Revolution
Cylindrical Shells Method
Formulas
Volume element of cylindrical shell: dV = 2π(radius)(height)(thickness)
Integral for volume: V = ∫2π(radius)(height) dy
Theorems
Cylindrical Shells Method
Suitable Grade Level
Grades 11-12 (High School Calculus)
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