A 0.0025 -kg bullet traveling at a speed of 425m/s is fired into a stationary 0.215-kg block of a ballistic pendulum. How high does the combination rise above blocks initial position

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The answer would be a

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.