to include in the computation can only lower the result (that is, make the result more negative).(c) The observation in the previous part implies that the work I do in removing sphere A(to obtain the case considered in part (a)) must lead to an increase in the system energy; thus, I do positive work. (d) To put sphere Aback in, I do negative work, since I am causing the system energy to become more negative. 78. (a) We note that rC(the distance from the origin to sphere C, which is the same as the
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