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When a system is taken from state A to s...

When a system is taken from state `A` to state `B` along path `ACB` as shown in figure below, `80 J` of heat flows into the system and the system does `30 J` of work.

When the system is returned from state `B` to `A` along the curve path, the work done on the system is `20 J`.
Does the system absorb or literate heat and by how much ?

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When a system is taken from state a to state b, in figure along the path a to c to b , 60J of heat flow into the system, and 30 J of work is done : (i) How much heat flows into the system along the path a to d to b if the work is 10J . (ii) When the system is returned from b to along the curved path, the work done by the system is -20J . Does the system absorb or liberate heat, and how much ? (iii) If , U_(a) = 0 and U_(d)= 22J , find the heat absorbed in the process a to d and d to b .

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