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As a firm believer in empirical study I drove to a public weigh station with a non charged and empty ipod.......weight of car plus non charged and empty ipod 1431kg..........I then charged up the ipod and filled it with songs and did the same....the result ? 1431kg....voila !!Glad I could help !
The first time I heard this podcast, I thought your answer of E=MC2 might be wrong. Because charging the battery only move electron from one chemical to another. So the total mass should not change.And I thought E=MC2 only works when nuclear reaction taken place.After searching through Wikipedia, I found out that, the formula works even with normal chemical or physics reaction.Physics, for instance, when something speeds up, its would gain more mass.And when you charge the battery, electron moves from a track of an atom to another track of another atom. Then the electron moves faster(probably..), and because it moves faster, it gains weight.That is my explain to this.
Sorry but it's not this the reason. Even if there weren't any electron movements at all the battery's mass would increase the same because of the flux of electromagnetic field (which carries energy).
Quote from: lightarrow on 18/09/2008 12:51:12Sorry but it's not this the reason. Even if there weren't any electron movements at all the battery's mass would increase the same because of the flux of electromagnetic field (which carries energy).Do you mean that if we let a current flow over a wire, the weight of the wire would also increase?When a current flow over a wire, electrons are moving faster? than when they are on the track, right?
The mass of a body is a measure of its energy-content; if the energy changes by L, the mass changes in the same sense by L/9 ◊ 1020, the energy being measured in ergs, and the mass in grammes.