Which free-body diagram BEST describes the brick hanging from the string below

Divide 108.2 x 10^6 into 1.5 x 10 and the result will be in au (astronomical units)

The speed was not exceeded so it was slow

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.