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

Quizplus · Accepted Answer

In an isolated system of two bodies that exert gravitational forces on one another, the only quantities that remain constant are the total energy and the total angular momentum of the system. The angular positions of the two bodies are not constant and can change over time. Therefore, option C is not correct. Option D is incorrect because option C is incorrect. So, the correct choice is only (a) and (b) above, which is E.

In an Isolated System of Two Bodies That Exert Gravitational