(a) In 77, remove sphere A and calculate the gravitational
Chapter 13, Problem 78(choose chapter or problem)
(a) In 77, remove sphere A and calculate the gravitational potential energy of the remaining three-particle system. (b) If A is then put back in place, is the potential energy of the four-particle system more or less than that of the system in (a)? (c) In (a), is the work done by you to remove A positive or negative? (d) In (b), is the work done by you to replace A positive or negative?
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