A radio telescope 200 m in diameter is used to investigate ...

[justinmsk]

A radio telescope 200 m in diameter is used to investigate sources emitting a 21-cm wavelength wave. What is the minimum angular separation of the sources that can be resolved by this system?
 
  A) 0.073
  B) 0.030
  C) 0.0013
  D) 0.154
  E) 0.0026

Question 2

An unusual spring has a restoring force of magnitude F = (2.00 N/m)x + (1.00 N/m2)x2, where x is the stretch of the spring from its equilibrium length.
 
  A 3.00-kg object is attached to this spring and released from rest after stretching the spring 1.50 m. If the object slides over a frictionless horizontal surface, how fast is it moving when the spring returns to its equilibrium length?
  A) 2.06 m/s
  B) 4.33 m/s
  C) 3.27 m/s
  D) 5.48 m/s
  E) 1.50 m/s

[karlss]

Answer to Question 1

A

Answer to Question 2

E