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An unsteady state balance differs from a steady state one by retaining

  • A.the accumulation term
  • B.the generation term
  • C.all the flow terms
  • D.all the energy terms

Answer: A

At steady state nothing changes with time and accumulation vanishes, which is what reduces the balance to input equals output. Retaining it turns an algebraic equation into a differential one. Time then becomes an explicit variable.

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