(a) how far is the center of mass of the earth-moon system from the center of the earth? (appendix c gives the masses of the earth and the moon and the distance between the two.) m
(b) express the answer to (a) as a fraction of the earth's radius.'

Excuse ! extra points plus ! super desperate ! the position of an object does not move relative to a reference point. relative to the reference point the object _. a.) is not moving. b.) is moving.

How do you tell if someone actually cares about you? and just say they do?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.