US Naval pilots "We see UFO everyday for at least a couple of years"

Charge is simply moved from one capacitor plate to the other - there is no net gain in charge.

To move the charge requires an input of energy which is then stored in the electric field that has been established between the capacitor plates.

A capacitor therefore stores energy which will have a small mass equivalence.
 
That's a tricky one!

In Newtonian mechanics, the energy transferred does not belong to the rock, but is stored in the gravitational field.

The rock and planet Earth form a gravitational system.

Raising the rock contributes to the mass of the system.
 
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:D
 

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