Volumes of Solids of Revolution Quiz
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Questions and Answers

What is the radius of the shell?

  • x^2
  • x (correct)
  • 2x
  • sqrt(x)
  • What is the height of the shell?

  • 1/x
  • x (correct)
  • x^2
  • 2x
  • What is the integral used to find the volume?

  • ∫(2πx)dx
  • ∫(πx^2)dx
  • ∫(2πx^2)dx (correct)
  • ∫(πx)dx
  • What is the volume of the solid?

    <p>128π cubic units</p> Signup and view all the answers

    What is the alternate method used to find the volume?

    <p>Washer method</p> Signup and view all the answers

    What is the integral used in the washer method?

    <p>∫(x^2 - x)dy</p> Signup and view all the answers

    What is the purpose of identifying the limits of integration?

    <p>To determine the bounds of the integral</p> Signup and view all the answers

    What is the advantage of using the washer method?

    <p>It can be used for more complex shapes</p> Signup and view all the answers

    What is the disadvantage of using the shell method?

    <p>It can only be used for simple shapes</p> Signup and view all the answers

    What is the purpose of finding the volume of a solid?

    <p>To determine the amount of material needed</p> Signup and view all the answers

    Study Notes

    Volumes of Solids of Revolution

    • Solids of revolution are solids whose shapes can be generated by revolving plane regions about axes.
    • The method of slicing is commonly used to find the volumes of solids of revolution.
    • The disk method, washer method, and cylindrical shell method can be used to find the volumes of solids of revolution.

    Disk Method

    • If a region bounded by a curve y = f(x), the x-axis, x = a, and x = b is revolved about the x-axis, a solid is generated.
    • The typical cross-section of the solid perpendicular to the axis of revolution is a disk of radius f(x) and area A(x) = π[f(x)]².
    • The solid's volume is the integral of A from x = a to x = b.

    Exercises

    • Find the volume of a cap of height h formed from a sphere of radius r.
    • Find the volume of a right pyramid with a square base of side and height.
    • Calculate the volume of the solid generated by revolving the plane region bounded by y = x, x = 4, and y = 1/2 about the x-axis.
    • Compute the volume of the solid generated by revolving the plane region bounded by y = x², y = 9, and x = 0 about the x-axis.

    Examples

    • The base of a solid is an ellipse b²x² + a²y² = a²b². Each cross-section perpendicular to the x-axis is a square with ends of a side on the ellipse.
    • A solid has a circular base of radius 2. Parallel cross-sections perpendicular to its base are equilateral triangles.
    • The radius of a hemispherical vat is 5 ft, and it contains a liquid to a depth of 4 ft. Find the volume of the liquid.

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    Description

    Test your understanding of volumes of solids of revolution with these 10 questions. Calculate volumes of caps, pyramids, and solids generated by revolving plane regions.

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