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$V$ fixed/background Let's begin by not worrying about what's sourcing the potential. If the physics is well-described in a particular frame by a potential $V$, we may (following the OP) set that pote …

Let's put a more precise description to the other answers, particularly Neil's. First, note that there is a Gauss Law for static gravitational fields, owing to the inverse square nature of the static …

I'd like to add mainly to Frederic Brünner's and Anna V's answers. Let's begin with, as Frederic does: Sunlight does not point back to the sun’s true center of gravity, whereas gravity always poi …

First let me point out that if you got to the surface, you had to have some velocity when you arrived. To actually arrive with zero velocity, you have to stop, and then arrive, which seems pretty cont …

The last part of the question (v4) is a duplicate of this and this Phys.SE questions and links therein. Here we will only address the first part of the question (v4). The formalism of gravitoelectro …

For example, Kaluza Klein theory considers a 5-dimensional spacetime where the $g_{5\nu}$ and vice versa terms of the metric produce your electromagnetic potential ($g_{55}$ is introduced as a new ter …

Not much sense. Your "center of charge" is nothing but the dipole moment divided by the net total charge. "Normalised dipole moment, if you will". If you take $q|\vec v|$ instead of $q\vec v$, you ge …

The radiated electromagnetic power from an non-relativistic accelerated charge is given by the Larmor formula P = $(2/3)(1/4\pi \epsilon 0)q^2a^2/c^3$. Given the gravitoelectromagnetic approximation …

In this online tutorial, aimed at pea-brains like me, the authors restate Einstein's equation $$ \mathbf{G}_{\mu\nu} = \frac{8 \pi G}{c^4} \mathbf{T}_{\mu\nu} $$ in words: Given a small ball of …

Comments to the question (v1): In Newtonian mechanics with Newtonian gravity, a body can have orbital angular momentum wrt. a reference frame. A non-point-mass can also have spin angular momentum. B …

There are a couple mistaken assumptions in your questions, which render your questions meaningless. First, wood has almost no effect on a steady magnetic field. The relative permeability of wood is …

It could be used to account the gravitoelectric effects http://en.wikipedia.org/wiki/Gravitoelectromagnetism These equations (similar to the maxwell equations of electromagnetism) allows explain astro …

The gravitational analogue of magnetism is called "gravitomagnetism" (and the general mathematical analogy between Maxwell's equations and gravitation in general relativity is called gravito-electroma …

By separating magnetism from electromagnetism and then by saying that magnetism produces electricity you contradict yourself. Also there is simple statement which forbid the statement from the head of …

Even though there is no experimental evidence, that the Alcubierre drive works. The Einstein field equations permit this solution. For Gravitoelectromagnetism there are hints and ongoing efforts to te …