The efficiency of an electric motor is 20 %. When lifting a body 500 J of energy are wasted. What is the useful work done by the motor?
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Answer:
Eff. = Eo/Ei = 0.2.
Eff. = Eo/(Eo+500) = 0.2.
Eo = 0.2Eo+100,
0.8Eo = 100,
Eo = 125J. = Energy out = Useful work.
Explanation:
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