Question

Using the disc method, find the volume of the solid formed by revolving the region bounded by \( y = x^2 \) and \( y = 0 \) from \( x = 0 \) to \( x = 2 \) about the x-axis.

Ask by Salazar West. in Portugal
Jan 23,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The volume of the solid is \( \frac{32}{5} \pi \).

Solution

To find the volume of the solid formed by revolving the region bounded by \( y = x^2 \) and \( y = 0 \) from \( x = 0 \) to \( x = 2 \) about the \( x \)-axis using the **disk method**, follow these steps: ### Disk Method Formula When rotating around the \( x \)-axis, the volume \( V \) is given by: \[ V = \pi \int_{a}^{b} [f(x)]^2 \, dx \] where: - \( f(x) \) is the function representing the boundary of the region. - \( [a, b] \) is the interval of integration. ### Applying to the Given Problem 1. **Identify \( f(x) \):** \[ f(x) = x^2 \] 2. **Set up the integral:** \[ V = \pi \int_{0}^{2} (x^2)^2 \, dx = \pi \int_{0}^{2} x^4 \, dx \] 3. **Evaluate the integral:** \[ \int x^4 \, dx = \frac{x^5}{5} + C \] Applying the limits from 0 to 2: \[ \left. \frac{x^5}{5} \right|_{0}^{2} = \frac{2^5}{5} - \frac{0^5}{5} = \frac{32}{5} \] 4. **Multiply by \( \pi \) to get the volume:** \[ V = \pi \times \frac{32}{5} = \frac{32}{5} \pi \] ### Final Answer \[ V = \frac{32}{5} \pi \]

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To find the volume of the solid formed by revolving the region bounded by \( y = x^2 \) and \( y = 0 \) from \( x = 0 \) to \( x = 2 \) about the x-axis using the disk method, we start by determining the radius of the disks. The radius at any point \( x \) is given by the value of the function \( y = x^2 \). The volume \( V \) can be calculated using the following integral formula: \[ V = \pi \int_{a}^{b} [f(x)]^2 \, dx \] In this case, \( f(x) = x^2 \), \( a = 0 \), and \( b = 2 \). Thus, we can set up the integral: \[ V = \pi \int_{0}^{2} (x^2)^2 \, dx \] This simplifies to: \[ V = \pi \int_{0}^{2} x^4 \, dx \] Now we compute the integral: \[ \int x^4 \, dx = \frac{x^5}{5} \] Evaluating this from 0 to 2 gives: \[ = \left[ \frac{x^5}{5} \right]_{0}^{2} = \frac{2^5}{5} - \frac{0^5}{5} = \frac{32}{5} \] Finally, we multiply by \( \pi \): \[ V = \pi \cdot \frac{32}{5} \] Thus, the volume of the solid is: \[ V = \frac{32\pi}{5} \] So, the volume of the solid formed by revolving the region bounded by \( y = x^2 \) and \( y = 0 \) from \( x = 0 \) to \( x = 2 \) about the x-axis is \( \frac{32\pi}{5} \) cubic units.

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