Because people wanted the ability to hover in mid-air.
Generally, yes.
yes
No, a helicopter hovering in mid air over America will not find itself hovering over India the next day. I think you are wondering if you can suspend yourself somehow in mid air the Earth will rotate beneath you, enabling you to come down to Earth where you like. That would be wonderful, but it does not work that way.Earth and atmosphere [and helicopter] will rotate together
OF COURS NOT!it wud take that the temperature is -90c for it to freaze
Hovering in mid-air is not physically possible without the help of special equipment like a jetpack or helicopter. Gravity always pulls objects towards the ground, so staying suspended in mid-air requires continual force countering gravity's pull.
Air does not freeze because it is a mixture of gases, primarily nitrogen, oxygen, carbon dioxide, and water vapor. However, the freezing point of water vapor in the air is 32°F (0°C).
helicopter
-150 degrees
An air ambulance helicopter is generally the same as an ordinary helicopter except for the fact that it is equipped to save lives just as a regular ambulance is equipped. Air ambulance helicopters must have the medical supplies necessary to save lives.
The helicopter blades push air down. By Newton's third law, the air pushes the helicopter upward.
Join the army or air force as a helicopter pilot.