In an isolated system of two bodies that exert gravitational ...

[maychende]

In an isolated system of two bodies that exert gravitational forces on one another, the quantity (quantities) that remain(s) constant is(are)
 a. the total energy of the system.
  b. the total angular momentum of the system.
  c. the angular positions of the two bodies.
  d. all of the above. e. only (a) and (b) above.

Question 2

Which of the following quantities is conserved for a planet orbiting a star in a circular orbit? Only the planet itself is to be taken as the system; the star is not included.
 a. Momentum and energy.
  b. Energy and angular momentum.
  c. Momentum and angular momentum.
  d. Momentum, angular momentum and energy.
  e. None of the above.

[TINA]

Answer to Question 1

E

Answer to Question 2

B

[maychende]

TYSM

[nothere]

Excellent