Which is the most common type of spacecraft propulsion used ...

[Bob-Dole]

Which is the most common type of spacecraft propulsion used today?
 
  A) solar sails
  B) nuclear rockets
  C) ion engines
  D) chemical rockets

Question 2

A planet speeds up in its orbit as it gets closer to the sun because of
 
  A) the torque exerted on the planet by the sun.
  B) conservation of energy.
  C) conservation of momentum.
  D) conservation of angular momentum.
  E) inertia.

[dajones82]

Answer to Question 1

D

Answer to Question 2

D

[Bob-Dole]

YES! Correct, THANKS for helping me on my review

[atrochim]

Thanks for the timely response, appreciate it