Explanations:The construction of aircraft requires materials that are both strong and lightweight to ensure the aircraft can achieve the necessary performance and fuel efficiency. Two of the most commonly used materials in aircraft construction are aluminum and titanium. These materials are chosen for their specific properties that make them ideal for the aerospace industry.
Aluminum is widely used in aircraft construction due to its high strength-to-weight ratio. It is lightweight, which is crucial for reducing the overall weight of the aircraft, thereby improving fuel efficiency and performance. Additionally, aluminum is corrosion-resistant, which is important for the longevity of the aircraft. It is used in various parts of the aircraft, including the fuselage, wings, and other structural components.
Titanium is another material that is frequently used in aircraft construction. It is known for its high strength, low density, and excellent corrosion resistance. Titanium is particularly useful in areas of the aircraft that are subjected to high stress or extreme temperatures, such as engine components and landing gear. Its strength and lightweight properties make it a valuable material for enhancing the structural integrity of the aircraft while keeping the weight down.
Coal, on the other hand, is not used in the construction of aircraft. Coal is primarily used as a source of energy for power generation and is not suitable for the manufacturing of aircraft parts due to its heavy weight and lack of structural integrity.
Therefore, the correct answer is that both aluminum and titanium are used in making airplane body parts. This combination of materials ensures that the aircraft is both strong and lightweight, which is essential for optimal performance and safety.