ch20-p029

# ch20-p029 - 29. (a) Energy is added as heat during the...

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W = Q = 1.47 × 10 3 J – 5.54 × 10 2 J = 9.18 × 10 2 J. (d) The efficiency is ε = W / Q in = (9.18 × 10 2 J)/(1.47 × 10 3 J) = 0.624 = 62.4%. 29. (a) Energy is added as heat during the portion of the process from a to b . This portion occurs at constant volume ( V b ), so Q in = nC V Δ T . The gas is a monatomic ideal gas, so 3/ 2 V CR = and the ideal gas law gives Δ T = (1/ nR )( p b V b – p a V a ) = (1/ nR )( p b – p a ) V b . Thus, () 3 in 2 ba b Qp p V =− . V b and p b are given. We need to find p a . Now p a is the same as p c and points c and b are connected by an adiabatic process. Thus, cc bb p Vp V γγ = and 53 64 1 = = = 1.013 10 Pa = 3.167 10 Pa. 8.00 b ac b c V pp p V γ §· ×× ¨¸ ¨¸ ©¹ The energy added as heat is ( ) 3 3 3 in 3 = 1.013 10 Pa 3.167 10 Pa 1.00 10 m
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## This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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