Questions tagged [potential-energy]

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4 votes
2 answers

How is the potential-density pair relation derived?

How can it be shown that $$\nabla^2\phi = 4\pi G \rho(\vec{r})$$ ?
1 vote
0 answers

Is it coincidence that the change in GPE when falling from deep space into the largest know neutron star is approximately mc squared Joules?

We can calculate the change in GPE in falling from a very long distance to the surface of a star or planet from $$\Delta{GPE} = \int_{r}^{\infty}mg\,dh $$ But taking into account that g will change ...
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