Explain what is the meaning of positive connotation and negative connotation.

That it is a good one and bad one that's what I think hope it helps!:)

The emotions and associations connected to a word depending on our experiences is known as it's connotative meaning. It's determined to be positive or negative.
Examples: 
Positive- childlike, dove(peace), hollywood(fame), home, lean, modest, slender, youthful
Negative- chatty, miserly, mutt, pushy, skinny, uppity, babe(woman), chick (woman)

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.