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In a refrigerator, one removes heat from a lower temperature and deposits to the surroundings at a higher temperature. In this process, mechanical work has to be done, which is provided by an electric motor. If the motor is of 1kW power, and heat is transferred from -3C to 27 C, find the heat taken out of the refrigerator per second assuming its efficiency is 50% of a perfect engine.
Efficiency of the Carnot engine is