The maintenance of equilibrium while stationary or moving is termed

Inertia. Alternatively, this can be defined or phrased as the resistance of an object to change its motion. This motion could be direction, speed or more. The principle of inertia is core in physics and is Newton’s First Law of Motion.

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.

Answervery cold;