Volume Calculation Using the Washer Method

The video tutorial explains how to find the volume of a solid formed by rotating a bounded region R around the x-axis using the washer method. It begins by defining the region R and visualizing it in 3D. The tutorial then details the setup of the integral, including determining the outer and inner radii. It proceeds to simplify the integrand and calculate the volume, resulting in a final volume of 108π cubic units.

What are the boundaries of the region R?

• y = x + 1, y = x + 4, x = 0, x = 4

• y = x + 4, y = x + 7, x = 3, x = 7

• y = x + 2, y = x + 5, x = 1, x = 5

• y = x + 3, y = x + 6, x = 2, x = 6

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CCSS.8.G.C.9

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What method is used to calculate the volume of the solid?

• Disk Method

• Shell Method

• Cavalieri's Principle

• Washer Method

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In the washer method, what does the outer radius represent?

• The distance from the axis of rotation to the outer curve

• The distance from the axis of rotation to the inner curve

• The height of the solid

• The width of the solid

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CCSS.8.G.C.9

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What is the expression for the outer radius, R(x), in this problem?

• x + 3

• x + 2

• x + 1

• x + 4

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CCSS.8.G.C.9

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What is the expression for the inner radius, r(x), in this problem?

• x + 2

• x + 4

• x + 3

• x + 1

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CCSS.8.G.C.9

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What are the limits of integration for the volume calculation?

• 0 to 4

• 0 to 3

• 0 to 5

• 0 to 2

What is the simplified form of the integrand function?

• 3x + 6

• 4x + 8

• 5x + 10

• 6x + 15

What is the antiderivative of the integrand function?

• 4x^2 + 20x

• x^2 + 5x

• 2x^2 + 10x

• 3x^2 + 15x

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CCSS.8.G.C.9

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What is the final volume of the solid in cubic units?

• 100π

• 108π

• 80π

• 90π

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What is the significance of the factor of π in the volume calculation?

• It is a constant with no significance.

• It is used to convert units.

• It represents the height of the solid.

• It accounts for the circular cross-sections of the solid.

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CCSS.8.G.C.9

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