Why do jet engines have to be made of alloys?

2. What caused the two Comet crashes of 1954?

3. What advantages do turbine engines have over reciprocating engines?

4. What is distinctive about the Boeing 747 that makes it easy to spot?

5. What factors ended the Concorde program?

6. What changes did the jet era bring to airports?

7. What one big advantage do jet planes offer passengers?

8. What are some design features aircraft of the future may include?

9. How long would it take to fly from New York to London in a hypersonic aircraft?

How would widespread supersonic air travel change the world?

What would be some good consequences, and what would be some bad ones?

I only know know1

Jet engines r made of alloys because its super light

Explanation:

indigenous people north and south were displaced, died of disease, and were killed by europeans through slavery, rxpe, and war. in 1491, about 145 million people lived in the western hemisphere. by 1691, the population of indigenous americans had declined by 90-95 percent, or by around 130 million people."

the results of roman expansion produced social conflict and civil war. julius caesar gained power and became a dictator but was then assassinated. the reign of augustus began a long period of imperial rule and peace in the roman empire. rome faced the problems of how to maintain peace, law, and order.

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