2. A lever lifting a 20kg weight has an input arm that is 1.5 m long, and an output arm of 0.7 m. What is the ideal mechanical advantage of the lever?

Sorry i don’t know what to do

During the 1800s. hope this !

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.