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The document you've uploaded appears to be a set of physics and mechanics problems titled **"TUGAS I"** (Task 1). Below is a breakdown of the content:

### 1. **Konversi Satuan (Unit Conversion)**
   - Conversion questions dealing with physical quantities and units, including primary and secondary SI units, as well as specific conversions related to water, enthalpy, specific heat, and thermal conductivity.

### 2. **Vektor (Vector)**
   - Problems related to force vectors, asking to:
     - Draw two forces.
     - Perform vector operations like addition, subtraction, and calculating cross products.
     - Solve for resultant forces and angles between vectors.

### 3. **Truss/Equilibrium of Forces (Bila θ = 45°)**:
   - This is a structural mechanics problem, asking to calculate the tension in the rope on two rods, AB and BC, given a certain configuration.

### 4. **Static Equilibrium on a Bar**
   - A static problem involving a bar of 5 meters in length and a weight of 80 N, dealing with friction, reaction forces, and angles.

### 5. **Spatial Force Problem**
   - Another force problem in 3D space, involving forces with magnitudes of 30 N and 40 N, asking to find the resultant force, the moment about a point, and the angle between the two forces using vector cross product.

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Which of these problems would you like to focus on first? Let me know if you'd like me to provide detailed explanations or help with a specific part of this task!

Here are 5 follow-up questions that can help expand your understanding:
1. How do you calculate the resultant of two vectors in 2D and 3D space?
2. What is the difference between scalar and vector quantities?
3. How do you approach finding moments about a point for a 3D force system?
4. What are the key differences between primary and secondary SI units?
5. How does the angle between forces affect the resultant in vector addition?

**Tip**: When calculating angles between vectors, remember that the dot product is a quick way to find the cosine of the angle between them!

The document contains questions on unit conversion, vector operations, equilibrium of forces, static equilibrium on a bar, and spatial force analysis.

This problem set covers various physics and mechanics concepts such as unit conversion, vector operations, static equilibrium, and spatial force analysis. Learn how to apply vector addition, cross products, and equilibrium conditions to solve complex force systems.

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