E=MC squared? Assuming this is correct which I assume it is, a rechargeable battery should weigh more when charged, compared to un charged, has anybody actually put this to the test?
Originally posted by Devilin
What about a large battery then ? Ok maybe the amount of charge/mass would be to small to measure, but has anybody anywhere actually put this theory to a practical Physical test?
That's a bit high, the highest I could find stored around 1,924,560jOriginally posted by Peter_C
The formula E=MC^2 gives you energy in joules when mass is in kilograms and the speed of light is in meters/second (approx 300*10^6)
Now if I recall correctly some 9V batteries store somwehere around 10 Mj of electrical energy.
Oops. You only divided by c here, not c² like you should have.
we work this out to be 10,000,000=M*C^2
Knowing C is approx 300,000,000 we divide: 10*10^6/300*10^6=0.0333... kg or.. 0.0000333.... grams.
That is a whopping 3/100,000th's of a gram in one 9v battery...
Originally posted by Peter_C
One thing I may be forgetting in the above post is that the molecular energy is stored similar to kinetic energy... it is potential energy waiting to be released... For example a compressed spring holds no more mass than the same spring uncompressed.