Evaluate (x +y) dz dy dx.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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**Evaluate the Triple Integral:**

\[
\int_{-2}^{2} \int_{-\sqrt{4-x^2}}^{\sqrt{4-x^2}} \int_{\sqrt{x^2+y^2}}^{2} (x^2 + y^2) \, dz \, dy \, dx
\]

**Solution:**

This iterated integral is a triple integral over the solid region \( E \).

- The region \( E = \{ (x, y, z) \, | \, -2 \leq x \leq 2, \, -\sqrt{4-x^2} \leq y \leq \sqrt{4-x^2}, \, \sqrt{x^2 + y^2} \leq z \leq 2 \} \)
  
  - The projection of \( E \) onto the xy-plane is the disk: \( x^2 + y^2 \leq 4 \).
  - The lower surface of \( E \) is the cone: \( z = \sqrt{x^2 + y^2} \).
  - The upper surface is the plane \( z = 2 \).

This region has a much simpler description in cylindrical coordinates:

- \( E = \{ (r, \theta, z) \, | \, 0 \leq \theta \leq 2\pi, \, 0 \leq r \leq 2, \, r \leq z \leq 2 \} \).

**Note to Reader:**

Set up but do not solve the integral needed using cylindrical coordinates.

**Diagrams:**

The diagram illustrates the geometric shape of the region \( E \), featuring:

1. **Cone:** With a vertex at the origin and extending upwards, its sides represented by \( z = \sqrt{x^2 + y^2} \).
2. **Plane:** The top boundary at \( z = 2 \).
3. **Cylindrical Representation:** The circular base is centered around the z-axis with a radius of 2, and the cylinder height is cut by the plane and the cone.
Transcribed Image Text:**Evaluate the Triple Integral:** \[ \int_{-2}^{2} \int_{-\sqrt{4-x^2}}^{\sqrt{4-x^2}} \int_{\sqrt{x^2+y^2}}^{2} (x^2 + y^2) \, dz \, dy \, dx \] **Solution:** This iterated integral is a triple integral over the solid region \( E \). - The region \( E = \{ (x, y, z) \, | \, -2 \leq x \leq 2, \, -\sqrt{4-x^2} \leq y \leq \sqrt{4-x^2}, \, \sqrt{x^2 + y^2} \leq z \leq 2 \} \) - The projection of \( E \) onto the xy-plane is the disk: \( x^2 + y^2 \leq 4 \). - The lower surface of \( E \) is the cone: \( z = \sqrt{x^2 + y^2} \). - The upper surface is the plane \( z = 2 \). This region has a much simpler description in cylindrical coordinates: - \( E = \{ (r, \theta, z) \, | \, 0 \leq \theta \leq 2\pi, \, 0 \leq r \leq 2, \, r \leq z \leq 2 \} \). **Note to Reader:** Set up but do not solve the integral needed using cylindrical coordinates. **Diagrams:** The diagram illustrates the geometric shape of the region \( E \), featuring: 1. **Cone:** With a vertex at the origin and extending upwards, its sides represented by \( z = \sqrt{x^2 + y^2} \). 2. **Plane:** The top boundary at \( z = 2 \). 3. **Cylindrical Representation:** The circular base is centered around the z-axis with a radius of 2, and the cylinder height is cut by the plane and the cone.
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