An 825-kg space vehicle is circling Earth in a circular orbit ...

[LaDunn]

An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km. Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this?
 
  The mass of Earth is 5.97  1024 kg and G = 6.67  10-11 N  m2/kg2.
  A) 1.00  109 J
  B) 1.30  1010 J
  C) 6.51  109 J
  D) 4.45  109 J
  E) 4.50  1010 J

Question 2

Two uniform solid spheres have the same mass, but one has twice the radius of the other. The ratio of the larger sphere's moment of inertia about a central axis to that of the smaller sphere is
 
  A) 4/5.
  B) 8/5.
  C) 1/2.
  D) 2.
  E) 4.

[kingdude89]

Answer to Question 1

B

Answer to Question 2

E

[LaDunn]

TYSM

[matt95]

Gracias!