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OpenStudy (anonymous):
If you have a device that has an energy efficiency of 0.4 and you put in 100 units of energy, how many units of useful energy will you get out of it? A. 0.4 B. 4 C. 40 If you have a device that has an energy efficiency of 0.4 and you put in 100 units of energy, how many units of useful energy will you get out of it? A. 0.4 B. 4 C. 40 @Physics
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