![## The position vector **r** describes the path of an object moving in the xy-plane.
### **Position Vector**
[
r(t) = t^2 \mathbf{i} + t \mathbf{j}
]
### **Point**
[
(4,, 2)
]
---
### **(a)** Find the velocity vector (v(t)), speed (s(t)), and acceleration vector (a(t)) of the object.
[
v(t) = \langle 2t,\ 1 \rangle
]
[
s(t) = \sqrt{4t^2 + 1}
]
[
a(t) = \langle 2,\ 0 \rangle
]
---
### **(b)** Evaluate the velocity vector and acceleration vector of the object at the given point.
[
v(2) = \langle 4,\ 1 \rangle
]
[
a(2) = \langle 2,\ 0 \rangle
]
1.讲解题目是什意思? 2.讲解解题过程](https://manimvideo.explanation.fun/video/cover/578766165717835777.png)
▶
## The position vector **r** describes the path of an object moving in the xy-plane.
### **Position Vector**
[
r(t) = t^2 \mathbf{i} + t \mathbf{j}
]
### **Point**
[
(4,, 2)
]
---
### **(a)** Find the velocity vector (v(t)), speed (s(t)), and acceleration vector (a(t)) of the object.
[
v(t) = \langle 2t,\ 1 \rangle
]
[
s(t) = \sqrt{4t^2 + 1}
]
[
a(t) = \langle 2,\ 0 \rangle
]
---
### **(b)** Evaluate the velocity vector and acceleration vector of the object at the given point.
[
v(2) = \langle 4,\ 1 \rangle
]
[
a(2) = \langle 2,\ 0 \rangle
]
1.讲解题目是什意思? 2.讲解解题过程
![Here’s the full markdown version of your provided images:
---
### (a) Adjacency List Representation
**Graph:**
Vertices: a, b, c, d
**Adjacency List:**
| Vertex | Adjacent Vertices |
| :----: | :---------------: |
| a | c |
| b | d |
| c | b, d |
| d | b |
---
### (b) Adjacency Matrix Representation
**Graph:**
Vertices: a, b, c, d
**Adjacency Matrix:**
[
M_b =
\begin{pmatrix}
& a & b & c & d \
a & 0 & 1 & 0 & 1 \
b & 1 & 0 & 1 & 1 \
c & 0 & 1 & 0 & 1 \
d & 1 & 1 & 1 & 0
\end{pmatrix}
]
---
### (c) Adjacency Matrix Representation
**Graph:**
Vertices: a, b, c, d
**Adjacency Matrix:**
[
M_c =
\begin{pmatrix}
& a & b & c & d \
a & 1 & 0 & 1 & 1 \
b & 0 & 1 & 0 & 1 \
c & 1 & 1 & 1 & 0 \
d & 0 & 1 & 0 & 1
\end{pmatrix}
]
---
注意使用 mathtex 显示公式
中文输出](https://manimvideo.explanation.fun/video/cover/578443240306839553.png)
▶
Here’s the full markdown version of your provided images:
---
### (a) Adjacency List Representation
**Graph:**
Vertices: a, b, c, d
**Adjacency List:**
| Vertex | Adjacent Vertices |
| :----: | :---------------: |
| a | c |
| b | d |
| c | b, d |
| d | b |
---
### (b) Adjacency Matrix Representation
**Graph:**
Vertices: a, b, c, d
**Adjacency Matrix:**
[
M_b =
\begin{pmatrix}
& a & b & c & d \
a & 0 & 1 & 0 & 1 \
b & 1 & 0 & 1 & 1 \
c & 0 & 1 & 0 & 1 \
d & 1 & 1 & 1 & 0
\end{pmatrix}
]
---
### (c) Adjacency Matrix Representation
**Graph:**
Vertices: a, b, c, d
**Adjacency Matrix:**
[
M_c =
\begin{pmatrix}
& a & b & c & d \
a & 1 & 0 & 1 & 1 \
b & 0 & 1 & 0 & 1 \
c & 1 & 1 & 1 & 0 \
d & 0 & 1 & 0 & 1
\end{pmatrix}
]
---
注意使用 mathtex 显示公式
中文输出