If in the absence of external forces, a rotating ball of hot gas ...

[Davideckstein7]

If in the absence of external forces, a rotating ball of hot gas cools and contracts, its rate of rotation
 
  1) decreases
  2) remains essentially the same
  3) increases
 
  and its angular momentum
  4) decreases.
  5) remains essentially the same.
  6) increases.

Question 2

If the polar ice caps melted and flowed toward the equator, the rotation of Earth would tend to
 
  1) decrease in angular speed,
  2) be unchanged,
  3) increase in angular speed,
 
  with the result that the day would be
  4) slightly longer.
  5) slightly shorter.
  6) unaffected.

[kusterl]

Answer to Question 1

Answer: 3, 5

Answer to Question 2

Answer: 1, 4

[Davideckstein7]

Thank you!

[kusterl]

Always glad to help...