The speed of the car changes from 12 metre per square to 24 metre per square in 1 minute the magnitude of acceleration of the car is a)Zero B )0.25 metre square c)1÷13 m/s^2 d.) 1÷5m/s^2

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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.

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