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straight A space system space performs space work space increment W space when space an space amount space of space heat space is space increment Q space added space to space the space system comma space the space corresponding space
change space in space the space internal space energy space is space space straight capital delta U space. space straight A space unique space function space of space the space initial space and space final space states space left parenthesis irrespective space
of space the space mode space of space change right parenthesis space

  1. straight capital delta Q
  2. straight capital delta W
  3. straight capital delta U text  and  end text straight capital delta Q
  4. straight capital delta U

The correct answer is: straight capital delta U


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