When a system is taken from state A to state B along the path ACB, 80 k cal of heat flows into the system and 30 k cal of work is done.
(a) How much heat flows into the system along path ADB if the work done is 10 k cal ?
(b) When the system is returned from B to A along the curved path the work done is 20 k cal. Does the system absorb or liberate heat.
(c) If UA = 0 and UD = 40 k cal, find the heat absorbed in the process AD
