Question

A rigid tank contains a hot fluid that is cooled while being stirred by a paddle wheel.Initialy ,the internal energy of the fluid is 800kj. During the cooling process, the fluid loses 500kj of heat, and the paddle wheel does 100kj of work on the fluid. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel.

Answer 1

The final internal energy of the fluid can be determined by subtracting the heat lost and work done on the fluid from the initial internal energy.

Final Internal Energy = Initial Internal Energy - Heat Lost - Work Done

Final Internal Energy = 800kj - 500kj - 100kj
Final Internal Energy = 200kj