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I see that you've uploaded an image containing two questions regarding mechanical engineering problems, particularly dealing with axial loads and trusses. I'll help you step by step with the solutions.

### Question 1:
The problem involves a bar **ABCD** made of aluminum, subjected to axial loads with different cross-sectional areas and lengths. The goal is to calculate the elongation (or deformation) of each section of the bar (AB, BC, and CD).

#### Given:
- Material: Aluminum, with **Modulus of Elasticity (E) = 70 GPa** = \( 70 \times 10^9 \, \text{Pa} \).
- Axial forces:
  - \( 5 \, \text{kN} \) on section AB,
  - \( 4 \, \text{kN} \) on section BC,
  - \( 15 \, \text{kN} \) on section CD.
- Cross-sectional areas:
  - AB: \( 24 \, \text{mm}^2 \),
  - BC: \( 38 \, \text{mm}^2 \),
  - CD: \( 30 \, \text{mm}^2 \).
- Lengths:
  - AB: \( 6 \, \text{mm} \),
  - BC: \( 24 \, \text{mm} \),
  - CD: \( 30 \, \text{mm} \).

We will use the formula for axial deformation \( \Delta L \):
\[
\Delta L = \frac{F L}{A E}
\]
Where:
- \( F \) is the force applied,
- \( L \) is the length of the section,
- \( A \) is the cross-sectional area,
- \( E \) is the modulus of elasticity.

Let's calculate the deformation for each section next:

### Deformation of AB:
\[
\Delta L_{AB} = \frac{5 \times 10^3 \times 6 \times 10^{-3}}{24 \times 10^{-6} \times 70 \times 10^9} = \frac{30}{1.68 \times 10^3} \, \text{mm}
\]

### Deformation of BC:
\[
\Delta L_{BC} = \frac{4 \times 10^3 \times 24 \times 10^{-3}}{38 \times 10^{-6} \times 70 \times 10^9} = \frac{96}{2.66 \times 10^3} \, \text{mm}
\]

### Deformation of CD:
\[
\Delta L_{CD} = \frac{15 \times 10^3 \times 30 \times 10^{-3}}{30 \times 10^{-6} \times 70 \times 10^9} = \frac{450}{2.1 \times 10^3} \, \text{mm}
\]

I will now calculate these values and provide the results.The elongation (deformation) values for each section are:

- **Section AB**: \( \Delta L_{AB} = 1.79 \times 10^{-5} \, \text{m} \) or **0.0179 mm**
- **Section BC**: \( \Delta L_{BC} = 3.61 \times 10^{-5} \, \text{m} \) or **0.0361 mm**
- **Section CD**: \( \Delta L_{CD} = 2.14 \times 10^{-4} \, \text{m} \) or **0.214 mm**

### Question 2:
The second problem involves a truss, and you are asked to determine the maximum load \( P \) that can be applied, such that the maximum normal stress in bars AB and CB does not exceed \( 140 \, \text{MPa} \).

Would you like me to proceed with solving Question 2? Let me know if you'd like more details on the current solution or if you have any questions.

---

Here are 5 relative questions to expand on this topic:
1. How does the modulus of elasticity affect deformation?
2. What happens to the bar if the force exceeds the yield strength of the material?
3. How is thermal expansion different from axial deformation?
4. Why is it important to consider cross-sectional area changes in materials under stress?
5. Can we use this method to calculate deformation for non-metal materials?

**Tip:** For problems involving deformation, always ensure that units are consistent (e.g., converting mm to meters) to avoid calculation errors.

Batang ABCD seperti yang ditunjukkan pada gambar di bawah ini memiliki bagian-bagian dengan penampang lintang yang berbeda-beda dan menerima beberapa beban aksial. Batang ini terbuat dari aluminium yang memiliki nilai modulus elastisitas 70 GPa. Tentukan perubahan panjang yang terjadi pada setiap bagian batang AB, BC, dan CD.

Calculate the deformation of each section of an aluminum bar ABCD subjected to varying axial loads. The problem uses concepts like modulus of elasticity (70 GPa) and the formula ΔL = (F * L) / (A * E) for sections AB, BC, and CD.

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