The advantage of using larger nut bolts is?

Options

A. They increase the mass of the system
B. The moment of inertia is increased
C. They can be unscrewed only by applying small force
D. They are connected to the system with greater strength

Answer

### Step-by-Step Solution:

1. **Understanding the Nut and Bolt System**:
- A nut and bolt system is commonly used to fasten two or more components together. The bolt is inserted through the nut and tightened to create a secure connection.

2. **Torque in the Nut and Bolt System**:
- When a force is applied to tighten the bolt, it generates torque. Torque (\( \tau \)) is defined as the product of the force (\( F \)) applied and the perpendicular distance (\( R \)) from the pivot point (the center of the nut) to the line of action of the force:
\[ \tau = F \times R \]

3. **Effect of Increasing the Length of the Bolt**:
- If we use a longer bolt, the distance \( R \) increases. Since torque is directly proportional to the distance \( R \), increasing \( R \) will result in a greater torque for the same amount of force applied.

4. **Advantages of Larger Nut Bolts**:
- With a larger nut bolt, the torque produced is greater, which means that you can achieve the same fastening effect with less applied force. This is particularly advantageous in applications where high torque is needed but the available force is limited.

5. **Conclusion**:
- Therefore, the main advantage of using larger nut bolts is that they allow for the connection to be tightened with a smaller force, while still providing a strong and secure fastening. This reduces the physical effort required to tighten the bolt and enhances the overall efficiency of the fastening process.

### Final Answer:
The advantage of using larger nut bolts is that they can be unscrewed only by applying a small force, allowing for greater torque with less effort.

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