Question
Sun February 13, 2011 By: Malik Tariq Ul Islam

Which of the following statement is correct for the system provided with heat by the surroundings when 1.change in heat is positive, change in internal energy is positive,work is done on the system. 2.change in heat is positive,change in internal energy is positive,work is done by the system. 3.change in heat is positive,change in internal energy is negative,work is done by the system. 4.change in heat is positive,change in internal energy is negative,work is done by the system. 5.none of the above. comment?

Expert Reply
Mon February 14, 2011
Dear student,
Options 3 and 4 are one and the same.
 
Heat absorbed, internal energy increases, and work is done on the system.
 
Work is another mode of transference of energy. Work is said to be done if the point of application of force undergoes displacement in the direction of the force. If the system loses energy, we say that the work is done by the system. Alternatively, if the system gains energy, we say that work is done on the system.
Hope this helps.
Team
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