Select the correct answer. x y 2.5 0.400 9.4 0.106 15.6 0.064 19.5 0.051 25.8 0.038 The table lists the values for two parameters, x and y, of an experiment. What is the estimated value of x for y = 0.049? A. 20.4 B. 21.4 C. 23.7 D. 24.7

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If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.