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# 4-2 - 3 What is the efﬁciency of a Carnot engine...

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Unformatted text preview: 3) What is the efﬁciency of a Carnot engine operating between a reservoir in which ice and water coexist, and a reservoir in which water and steam coexist? The pressure is at 1.0 atrn for both. A) 0.27% B} 27% C) 100% D) 1.0% 4] A heat pump with a COP 0134.7 absorbs heat from the atmosphere at a rate of 14 kW. At what rate is it doing work? A) 05 kW B) 3 kW C) 17 kW 13) 52 kW 5] A 9.0-mol monoatornic ideal gas at 312.0 K does a free adiabatic expansion {W = Q = 0) until its volume increases 10.0—fold. What is the change in entropy? Express your answer in terms of R. The formula for the entropy of an ideal gas is S = 11R in[(Wn) T343 ] + const. A) 21 R Lt'K B} 6500 RJJK C) 28,000 R L’K D] 0.0 RIIK 6) 15.0 kg of mercury (specific heat 140 Ifkg . K) is heated from 301.0 K to 346.0 K. How much does entropy increase? Use the formula for the entropy of a system with a constant heat capacity. A) 47 UK B} 95,000 UK C) 290 HE D) -0.91 UK 3) 4) 5) 6) ...
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