1. An object of mass 0.80 kg moves at a constant speed of 6.0 m/s in a circle of radius 3.4 m. What is its acceleration in m/s2 ? 2.Centripetal acceleration is the how fast you change your
A. speed

B. force

C. Speed or direction

D. direction

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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.