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PartA Select the equation that shows that the efficiency of a machine that has an input of 120 J and an output of 50 J is 0.42. o Efficiency= uttal een youtput Efficiency= useful energy output Cytotal energy input ficiency total energy input 50121201-042 120 J 50 J+1201-042 ー 50 J o Efficiency useful energy output total energy input 50 J -0.42 120J 0 Efficiency = useful energy output-120J-042 total energynpt 0 Submit Request Answer

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Sotutio Answer うopfon (C) 50 T total energy To put 120匤 0.42

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