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583_Physics ProblemsTechnical Physics

# 583_Physics ProblemsTechnical Physics - Chapter 20 Section...

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Chapter 20 585 Section 20.4 Work and Heat in Thermodynamic Processes P20.23 W PdV if i f = − z The work done on the gas is the negative of the area under the curve P V = α 2 between V i and V f . W V dV V V V V if i f f i f i = − = − = = = z α α 2 3 3 1 3 2 2 1 00 2 00 e j e j . . m m 3 3 P O V 1.00 m 3 2.00 m 3 P = V α 2 f i FIG. P20.23 W if = − × + L N M O Q P = 1 3 5 00 1 013 10 2 00 1 00 1 18 5 3 3 . . . . . atm m Pa atm m m MJ 6 3 3 e je j e j e j P20.24 (a) W PdV = − z W W i f = − × + × + × = 6 00 10 2 00 1 00 4 00 10 3 00 2 00 2 00 10 4 00 3 00 12 0 6 6 6 . . . . . . . . . . Pa m Pa m Pa m MJ 3 3 3 e j a f e j a f e j a f (b) W f i = + 12 0 . MJ FIG. P20.24 P20.25 W P V P nR P T T nR T f i = − = − F H G I K J = − = − = d i a fa fa f 0 200 8 314 280 466 . . J P20.26 W PdV P dV P V nR T nR T T i f i f = − = − = − = − = z z
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