Explain the range of effectiveness of each fundamental force by describing the distance that each force influence nearby matter gravitational force , electromagnetic force, strong force, and weak force

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.

34 degrees fahrenheit

Lexy is correct because angle r is between the incident wave,  n  = 0, and a diffracted wave.