The total internal energy change for a reversible isothermal cycle is

Options :
  1. always 100 calories per degree
  2. always negative
  3. zero
  4. none of the above
Answer and Explanation :-

Answer: Option 3


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Humans are similar to plasticine. Society is the pattern, but a pattern has the characteristics of being inflexible, hard, and unbreakable, while plasticine has the characteristics of being pliable, soft, metamorphic, and expandable. The current situation clearly shows us how the mass of plasticine no longer fits into that narrow social pattern.
-Paola Sanjinez Universes Within the Universe