ch19-p086 - 86. (a) The work done in a constant-pressure...

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3 2 2 21 3 1 1.8m (300K) 1.8 10 K. 3.0m V TT V §· == = × ¨¸ ©¹ It should be noted that this is consistent with the gas being monatomic (that is, if one assumes 3 2 V CR = and uses Eq. 19-45, one arrives at this same value for the final temperature). 86. (a) The work done in a constant-pressure process is W = p Δ V . Therefore, () 233 25N/m (1.8m 3.0m ) 30J. W =− = The sign conventions discussed in the textbook for Q indicate that we should write –75 J
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