If antonia exerts a force of 700 n to walk 6 m up a flight of stairs in 6s how much power does she use?

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

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.