If steam expands in the cylinder of a steam engine and does 750 J of work on the surroundings and simultaneously there is 250 J of energy transferred into the steam from the surroundings, what is the change in energy of the steam?

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The Answer of If steam expands in the cylinder of a steam engine and does 750 J of work on the surroundings and simultaneously there is 250 J of energy transferred into the steam from the surroundings, what is the change in energy of the steam?

If Steam Expands in the Cylinder of a Steam Engine