When can a truck have less momentum than a bike? A. only when the truck is not moving B. only when it's moving faster than the bike C. only when it's moving more slowly than the bike D. when it's not moving or when it's moving much more slowly than the bike

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.