Olivia fires an arrow at a bird sitting 20m up in a tree. The arrow has a mass of 0.010 kg and leaves the bow moving at 22 m/s from a height of 1.0 m above the ground. When the arrow impacts it is moving at 12 m/s. Find the fate of the bird using conservation of energy techniques

The answer should be a.

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.