Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
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### Vector Calculus Problem Set

#### Task: Compute derivatives and perform vector operations

Given the vector function:
\[ \mathbf{r}(t) = \frac{3}{2}t^2\mathbf{i} - 4t\mathbf{j} + \frac{2}{3}t^3\mathbf{k} \]

Find the following:
1. \(\mathbf{r}'(t)\)
2. \(\mathbf{r}''(t)\)
3. \(\mathbf{r}'(t) \cdot \mathbf{r}''(t)\)
4. \(\mathbf{r}'(t) \times \mathbf{r}''(t)\)

#### Solutions:

**(a) \(\mathbf{r}'(t)\)**
\[ \boxed{3t\mathbf{i} + 2t^2\mathbf{k} - 4\mathbf{j}} \]
This solution is correct.

**(b) \(\mathbf{r}''(t)\)**
\[ \boxed{4t\mathbf{k} + 3\mathbf{i}} \]
This solution is correct.

**(c) \(\mathbf{r}'(t) \cdot \mathbf{r}''(t)\)**
\[ \boxed{} \]
\[ \textcolor{red}{\text{Your answer cannot be understood or graded.}} \]

**(d) \(\mathbf{r}'(t) \times \mathbf{r}''(t)\)**
\[ \boxed{} \]
\[ \textcolor{red}{\text{Your answer cannot be understood or graded.}} \]

---

### Explanation of Graphs and Calculations

- **Part (a):** 
  - Compute the first derivative \(\mathbf{r}'(t)\) by differentiating each component of \(\mathbf{r}(t)\):
    \[ \mathbf{r}'(t) = \frac{d}{dt} \left( \frac{3}{2}t^2 \mathbf{i} - 4t\mathbf{j} + \frac{2}{3}t^3\mathbf{k} \right) \]
    \[ = 3t\mathbf{i} - 4\mathbf{j} + 2t^2\mathbf{k} \]

- **Part (b):**
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Transcribed Image Text:--- ### Vector Calculus Problem Set #### Task: Compute derivatives and perform vector operations Given the vector function: \[ \mathbf{r}(t) = \frac{3}{2}t^2\mathbf{i} - 4t\mathbf{j} + \frac{2}{3}t^3\mathbf{k} \] Find the following: 1. \(\mathbf{r}'(t)\) 2. \(\mathbf{r}''(t)\) 3. \(\mathbf{r}'(t) \cdot \mathbf{r}''(t)\) 4. \(\mathbf{r}'(t) \times \mathbf{r}''(t)\) #### Solutions: **(a) \(\mathbf{r}'(t)\)** \[ \boxed{3t\mathbf{i} + 2t^2\mathbf{k} - 4\mathbf{j}} \] This solution is correct. **(b) \(\mathbf{r}''(t)\)** \[ \boxed{4t\mathbf{k} + 3\mathbf{i}} \] This solution is correct. **(c) \(\mathbf{r}'(t) \cdot \mathbf{r}''(t)\)** \[ \boxed{} \] \[ \textcolor{red}{\text{Your answer cannot be understood or graded.}} \] **(d) \(\mathbf{r}'(t) \times \mathbf{r}''(t)\)** \[ \boxed{} \] \[ \textcolor{red}{\text{Your answer cannot be understood or graded.}} \] --- ### Explanation of Graphs and Calculations - **Part (a):** - Compute the first derivative \(\mathbf{r}'(t)\) by differentiating each component of \(\mathbf{r}(t)\): \[ \mathbf{r}'(t) = \frac{d}{dt} \left( \frac{3}{2}t^2 \mathbf{i} - 4t\mathbf{j} + \frac{2}{3}t^3\mathbf{k} \right) \] \[ = 3t\mathbf{i} - 4\mathbf{j} + 2t^2\mathbf{k} \] - **Part (b):**
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