In order to get large payloads into space using chemical rockets, ...

[theo]

In order to get large payloads into space using chemical rockets,
 
  A) multiple rocket stages are necessary
  B) extremely large single-staged rockets must be used
  C) very lightweight rockets
  D) rockets must be launched from the tops of tall mountains

Question 2

In an RLC circuit, the resistance is 10. ohms, the capacitive reactance is 30. ohms, and the inductive reactance is 50. ohms. What is the circuit impedance?
 
  A) 10.
  B) 22.
  C) 90.
  D) 63.
  E) 81.

[sylvia]

Answer to Question 1

A

Answer to Question 2

B