Understanding the Shell Method for Volume Calculation

This video tutorial covers the shell method for determining volume by rotating regions around axes other than the x and y axes. It begins with a review of the shell method, emphasizing the importance of the representative rectangle being parallel to the axis of rotation. The video explains how to handle both horizontal and vertical axis rotations, detailing the integration process with respect to y and x, respectively. Two examples are provided: one involving rotation around a vertical line (x=5) and another around a horizontal line (y=-1). The video concludes with calculations of the volume of solids formed by these rotations.

What is the primary consideration when using the shell method for volume calculation?

• The rectangle must be parallel to the axis of rotation.

• The rectangle must be horizontal regardless of the axis.

• The rectangle must be perpendicular to the axis of rotation.

• The rectangle must be diagonal to the axis of rotation.

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CCSS.8.G.C.9

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When rotating about a horizontal axis, with respect to which variable do we integrate?

• x

• z

• y

• t

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In the shell method, what does the radius represent when rotating about a vertical axis?

• The distance from the x-axis to the function.

• The distance from the y-axis to the function.

• The distance from the origin to the function.

• The distance from the function to the axis of rotation.

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CCSS.8.G.C.9

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In the first example, what is the expression for the radius function when rotating about x = 5?

• 5 + x

• 5 - x

• x - 5

• x + 5

What is the height function h(x) in the first example problem?

• sqrt(x)

• 1/x

• x^2

• x

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CCSS.8.G.C.9

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What is the final volume of the solid formed in the first example?

• 410π/15

• 420π/15

• 400π/15

• 416π/15

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In the second example, what is the expression for the radius function when rotating about y = -1?

• y - 1

• y + 1

• 1 - y

• 1 + y

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What is the height function h(y) in the second example problem?

• y^2

• sqrt(y)

• y

• 1/y

What are the limits of integration for the second example problem?

• 0 to 3

• 0 to 2

• 0 to 5

• 0 to 4

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CCSS.8.G.C.9

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What is the final volume of the solid formed in the second example?

• 50π/3

• 45π/3

• 35π/3

• 40π/3

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CCSS.8.G.C.9

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