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. . . to an unsophisticated teacher the following two
statements do seem to be contradictory.
"All potential energy must go to zero when the interacting
particles are infinitely far apart."
" PEgrv = 0 can be chosen arbitrarily at any distance
between a particle and the center of our planet."
Why is this not a paradox? If PEgrv MUST be zero at
infinity then we should never allow it to be zero at other
places, for example, at the sea level or at Mount Everest.
Ludwik Kowalski