What was the method recommended to avoid gaps in the array when an element is removed?
a. Shift all the entries beyond the new gap back one slot
b. Shift all the entries in front of the new gap up one slot
c. Set the pointer in the entry before the gap to the entry after the gap
d. Replace the entry being removed with the last entry in the array

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.