Problems:

2.20
2.21
2.22
2.24
3.36
3.79 Calculate the work

Answers:

2.20:	p = 4.0 bars
2.21:	V2 = 16.58 ft3; p2 = 53.31 ft/in2
2.22:	1W2 = -12 kJ
2.24:	1W2 = 80.5 kJ
3.36:	1W2/m = -31.62 kJ/kg
3.79:	Possibly 1W2 = 120 kJ (but I haven't done this one yet...

Hints:
2.21: You have 2 equation and 2 unknowns...
2.22: When states are LINEARLY related -- you can connect them with a STRAIGH LINE.   Then you may want to use geometry to determine the work (the area under the curve.

Please Remember:

• 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.
• 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.
• Be sure to use the proper "work equation" for you process.
• PLEASE try to be organized.