Spaceship VS Space elevator

What is one of the main advantages of a space elevator compared to conventional rocket systems to transport payload in space?

• There are no risks associated with the use of a space elevator.

• The specific cost to transport payload would be about 95% lower.

• Rockets require large amounts of fuel, while an elevator needs no energy to operate.

• There are no advantages, and rocket launches are much more exciting anyway.

What is the main limiting factor, currently, in the construction of a space elevator?

• The choice of where to construct the base

• Physicists still need to figure out how the centrifugal/centripetal accelerations work.

• Economic costs associated with design and construction

• The availability of materials to build the tether

What is the centrifugal acceleration?

• An apparent acceleration that is felt by objects in a rotating reference frame

• A real acceleration towards the center of rotation

• An acceleration present in any system of reference

• Another word for the centripetal acceleration

Where should the counterweight be located?

• Below the geostationary orbit

• 
  Exactly at the geostationary orbit

• Above the geostationary orbit

• 
  There is no need for a counterweight: the elevator will magically be in tension by itself.

Which of these materials could be used in the future to build a space elevator?

• A. Carbon nano tubes

• 
  B. Steel

• C. Diamond nano threads

• Both A and C are correct.