Final answer:
An airplane that can carry 1,500 to 3,000 people can meet the increasing demand for air travel. The material for the wings and body should be lightweight, strong, and durable. Using very expensive new materials can have tradeoffs, and improvement of existing materials can be achieved through various approaches.
Step-by-step explanation:
A. The need for an airplane that can carry 1,500 to 3,000 people would arise due to various reasons. One possible reason is the increasing demand for air travel, especially in densely populated regions or for long-haul flights. Such an airplane would allow airlines to transport a larger number of passengers efficiently.
B. The material for the wings and body of the airplane should have specific properties to ensure safe and efficient operation. These properties include being lightweight yet strong, having good aerodynamic characteristics, and being resistant to fatigue and corrosion. Materials like composite materials (such as carbon fiber composites) and advanced alloys (such as titanium) are commonly used for this purpose.
C. Using very expensive new materials can lead to tradeoffs. While these materials may offer superior strength-to-weight ratios or other desirable properties, their high cost can significantly increase the production cost of the airplane. This may result in increased ticket prices, which can affect the demand for air travel.
D. To improve an existing material, Charlia can consider various approaches. This can include incorporating new reinforcement techniques, optimizing the manufacturing process, using innovative surface coatings, or conducting research to identify alternative materials with better properties.