- #1
The_Duck
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Has any experiment detected the weight of energy, ##1/c^2 \approx 10^{-17}## kilograms/Joule?
Wikipedia claims that superconducting gravimeters can measure changes in gravitational force of one part in ##10^{12}##.
Wikipedia's table of energy densities says some batteries store of order 0.5 MJ/kg. The weight of 0.5 MJ is ##5 \times 10^{-12}## kilograms, so the weight of the stored energy is 5 parts in ##10^{12}## of the total weight. Could a superconducting gravimeter detect the difference in weight between a charged battery and a depleted one?
[I guess we can easily detect the weight of the binding energy of nuclei. But can we change the energy of a single object and detect the resulting change in the object's weight?]
Wikipedia claims that superconducting gravimeters can measure changes in gravitational force of one part in ##10^{12}##.
Wikipedia's table of energy densities says some batteries store of order 0.5 MJ/kg. The weight of 0.5 MJ is ##5 \times 10^{-12}## kilograms, so the weight of the stored energy is 5 parts in ##10^{12}## of the total weight. Could a superconducting gravimeter detect the difference in weight between a charged battery and a depleted one?
[I guess we can easily detect the weight of the binding energy of nuclei. But can we change the energy of a single object and detect the resulting change in the object's weight?]
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