Finding volume: Find the volume of the solid generated by revolving the region bounded by the x-axis and the curve y = x sin(x), 0 ≤ x ≤ π, about
a. The y-axis.
(See Exercise 57 for a graph.)

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Identify the region to be revolved: the area bounded by the curve \(y = x \sin(x)\), the x-axis (\(y=0\)), and the vertical lines \(x=0\) and \(x=\pi\).

Since the solid is generated by revolving around the y-axis, use the method of cylindrical shells. The formula for the volume is \(V = \int_a^b 2\pi \cdot (\text{radius}) \cdot (\text{height}) \, dx\).

Determine the radius and height of a typical shell: the radius is the distance from the y-axis, which is \(x\), and the height is the function value \(y = x \sin(x)\).

Set up the integral for the volume: \(V = \int_0^{\pi} 2\pi \cdot x \cdot (x \sin(x)) \, dx = \int_0^{\pi} 2\pi x^2 \sin(x) \, dx\).

Evaluate the integral \(\int_0^{\pi} x^2 \sin(x) \, dx\) using integration by parts twice, then multiply the result by \(2\pi\) to find the volume.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Volume of Solids of Revolution

This concept involves finding the volume of a 3D solid formed by rotating a 2D region around an axis. The volume can be computed using integral methods such as the disk/washer or shell method, depending on the axis of rotation and the shape of the region.

Shell Method

The shell method calculates volume by integrating cylindrical shells formed when the region is revolved around an axis. For rotation about the y-axis, vertical slices parallel to the axis create shells with radius and height functions, making it suitable for this problem.

Function Behavior and Bounds

Understanding the function y = x sin(x) and its behavior on the interval [0, π] is essential. Knowing the bounds and how the curve interacts with the x-axis helps set up correct integral limits and expressions for radius and height in the volume calculation.

Finding volume: Find the volume of the solid generated by revolving the region bounded by the x-axis and the curve y = x sin(x), 0 ≤ x ≤ π, abouta. The y-axis.(See Exercise 57 for a graph.)