654_Physics ProblemsTechnical Physics

654_Physics ProblemsTechnical Physics - 656 P22.62 Heat...

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656 Heat Engines, Entropy, and the Second Law of Thermodynamics P22.62 (a) For the isothermal process AB , the work on the gas is WP V V V W W AB A A B A AB AB =− F H G I K J × × F H G I K J × ln .. l n . . . 5 1 013 10 10 0 10 50 0 10 0 815 10 53 3 Pa m J 3 ej e j where we have used 1 00 1 013 10 5 atm Pa and 1 00 1 00 10 3 L m 3 FIG. P22.62 V BC B × × =+ × 1 013 10 10 0 50 0 10 4 05 10 3 Pa m J 3 af W CA = 0 and WW W AB BC eng J k J = × = 411 10 411 3 (b) Since AB is an isothermal process, E AB int, = 0 and QW AB AB = × 3 . J For an ideal monatomic gas, C R V = 3 2 and C R P = 5 2 TT PV nR R R BA BB == = ×× = × 1 013 10 50 0 10 505 10 3 . Also, T nR R R C CC = × 1 013 10 10 0 10 101 10 3 . Qn C T R R CA V F H G I K J ×−× F H G I K J = 100 3 2 5 05 10 1 01 10 608 33 . k J
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