What is the acceleration of a car as its velocity changes from +65 m/s to +45 mls in 5 seconds? -22 m/s2
-4.0 m/s2
+55 m/s2
O +110 m/s2

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.

A,d, and e on edgunuity