Math Problem Statement

Which of the following gives the volume obtained by rotating the region bounded by y = x^2 and y = 4 about the y-axis?

Solution

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extracted_text = pytesseract.image_to_string(image) extracted_textThe image contains a question about calculating the volume of a solid obtained by rotating a region bounded by y=x2y = x^2 and y=4y = 4 about the y-axis.

The question asks to identify the correct integral expression to compute this volume.

Here are the two options given:

  1. 02πx2dx\int_0^2 \pi x^2 \, dx
  2. 04πy2dy\int_0^4 \pi y^2 \, dy

To solve this:

Step 1: Identify the Bounds

The region is bounded by y=x2y = x^2 and y=4y = 4. This suggests the upper boundary is y=4y = 4, and the curve is described by y=x2y = x^2.

Step 2: Use the Method of Cylindrical Shells

Since the rotation is about the y-axis, we can use the method of cylindrical shells.

For cylindrical shells, the formula for volume is: V=ab2π(radius)(height)dxV = \int_{a}^{b} 2\pi \cdot \text{(radius)} \cdot \text{(height)} \, dx In this case:

  • Radius = xx (distance from the y-axis)
  • Height = 4x24 - x^2 (the distance between the curves y=4y = 4 and y=x2y = x^2)

Thus, the integral should be: V=022πx(4x2)dxV = \int_0^2 2\pi x \cdot (4 - x^2) \, dx This simplifies to: V=2π02x(4x2)dxV = 2\pi \int_0^2 x(4 - x^2) \, dx This is the appropriate integral to calculate the volume when rotating around the y-axis.

Step 3: Verify the Provided Options

The first option provided is 02πx2dx\int_0^2 \pi x^2 \, dx, which is not correct for this problem, as it doesn't consider the function 4x24 - x^2 for the height of the shell.

The second option 04πy2dy\int_0^4 \pi y^2 \, dy represents a formula for rotation around the x-axis, which is not applicable here.

Thus, the correct approach uses the method of cylindrical shells with the bounds 00 to 22, and the integrand involves the product of xx and (4x2)(4 - x^2).

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Math Problem Analysis

Mathematical Concepts

Volume of solids of revolution
Integration
Cylindrical shells method

Formulas

Volume = ∫(2π * radius * height) dx
y = x^2
y = 4

Theorems

Method of Cylindrical Shells

Suitable Grade Level

Undergraduate Calculus Level