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The formalism of the potential energy of two particles

Chapter 4, Problem 4.50

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QUESTION:

The formalism of the potential energy of two particles depends on the claim in (4.81) that V1U(r1 r2) = V2U(r1 r2). Prove this. (Use the chain rule for differentiation. The proof in three dimensions is notationally awkward, so prove the one-dimensional result that a a ax f (xi x2) = f (xi x2) , ax2 and then convince yourself that it extends to three dimensions.)

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QUESTION:

The formalism of the potential energy of two particles depends on the claim in (4.81) that V1U(r1 r2) = V2U(r1 r2). Prove this. (Use the chain rule for differentiation. The proof in three dimensions is notationally awkward, so prove the one-dimensional result that a a ax f (xi x2) = f (xi x2) , ax2 and then convince yourself that it extends to three dimensions.)

ANSWER:

Step 1 of 3

Consider the following.

                                    

 

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