585_Physics ProblemsTechnical Physics

585_Physics ProblemsTechnical Physics - 587 Chapter 20...

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Chapter 20 587 *P20.33 The area of a true semicircle is 1 2 2 π r . The arrow in Figure P20.33 looks like a semicircle when the scale makes 1.2 L fill the same space as 100 kPa. Its area is 1 2 24 200 1 2 24 10 2 10 35 ππ .. L k P a m N m 32 a fa f ej e j × . The work on the gas is WP d V EQ W A B =− + × × F H G I K J + =+ = = z area under the arch shown in the graph J N m m J J k J 23 int 1 2 2 4 200 3 10 4 8 10 754 1 440 2 190 5 790 2 190 3 60 53 . af bg 500 300 0 1.2 3.6 6.0 V (L) P (kPa) AB FIG. P20.33 Section 20.6 Some Applications of the First Law of Thermodynamics P20.34 (a) Wn R T V V PV V V f i ff f i F H G I K J F H G I K J ln ln so VV W if =+ F H G I K J = × L N M M O Q P P = exp . exp . 00250 3000 002501013 10 000765 5 m 3 (b) T nR f == × = 1 013 10 0 025 0 100 305 5 . Pa m mol 8.314 J K mol K 3 P20.35 (a) ∆∆ P V int 3 kJ kPa 3.00 m kJ =
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