Problems:

3.38 a,b,c,d,g	find the phase and the missing properties of p,v,T,x,u,h
3.56
3.93
3.105
Word Problem	(a) Find the change in specific internal energy (in kJ/kg) when an aluminum pie pan is heated from room temperature (68 degrees F) to 450 degrees F. (b) Find the change in specific internal energy (in kJ/kg) for a copper pot experiencing the same temperature change.

Answers:

3.38 a,b,c,d,g	no answers will be given.
3.56	(a) 1w2 = 147.7 kJ/kg (b) 1q2 = 161.8 kJ/kg
3.93	delta-h = 1487 kJ/kg
3.105	(a) 1Q2 = 32.88 kJ (b) 1Q2 = 28.21 kJ (c) 1Q2 = 27.24 kJ

Hints:
You may want to follow these steps

• Read EACH word.
• Draw some pictures (one for each state).
• Write the given information under each picture.
• Write what you know about the process.
• Write what it is you are to find.
• DRAW the process on a p-v plot.
• Write write the equations you are to use (or might want to use).
• If necessary, find the phase at each state.
• Be sure to indicate which tables you are using.

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