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2300_hw_3_sol - Homework#3 Solutions ME/CH EN 2300#1 2-22C...

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Homework #3 Solutions ME/CH EN 2300 #1 2-22C Point functions depend on the state only whereas the path functions depend on the path followed during a process. Properties of substances are point functions, heat and work are path functions. #2 2-24C ( a ) The car's radiator transfers heat from the hot engine cooling fluid to the cooler air. No work interaction occurs in the radiator. ( b ) The hot engine transfers heat to cooling fluid and ambient air while delivering work to the transmission. ( c ) The warm tires transfer heat to the cooler air and to some degree to the cooler road while no work is produced. No work is produced since there is no motion of the forces acting at the interface between the tire and road. ( d ) There is minor amount of heat transfer between the tires and road. Presuming that the tires are hotter than the road, the heat transfer is from the tires to the road. There is no work exchange associated with the road since it cannot move.
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