ch13-p078 - 78. (a) We note that rC (the distance from the...

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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 A back in, I do negative work, since I am causing the system energy to become more negative. 78. (a) We note that r C (the distance from the origin to sphere C , which is the same as the
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