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Dec11-12, 07:24 AM
P: 11,917
It would not generate any energy, as energy is conserved. You descibe an object known as perfect black body. There are very good approximations to this, but they cannot be used to harvest energy (unless you expose them to sunlight, solarthermal power plants exist) - in thermal equilibrium, they have to radiate away the same amount of energy, this follows from the second law of thermodynamics.