Posted by Kathrine on Wednesday, December 17, 2008 at 7:58pm.
PE is always to a reference. It is zero at infinity. But we commonly set some place (say ground level) and measure GPE in relation to that plane. Negative GPE means energy has to be given to get it back to zero. Example: refernce level is at 12 feet above ground. Below that, GPE is negative.
Okay, so using the ground level for your reference point if you went under the crust the GPE must be negative for the total energy to remain zero?
I think I get it! Thanks a lot!
That is it.
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