A Carnot engine works between two heat reservoirs at temperatures Th = 306 K and

Question

A Carnot engine works between two heat reservoirs at temperatures Th = 306 K and Tc = 78 K. "(a) What is its efficiency? 74.51 You currently have 1 submissions for this question. Only 10 submission are allowed You can make 9 more submissions for this question. Your subrns: Computed value 74 51 Submitied Saturday. September 29 t 4 40PM d Correct 20 (b) If it absorbs 95 J from the hot reservoir during each cycle, how much work does it do? 70.78 You currently have 1 submissions for this question. Only 10 submission are allowed You can make 9 more submissions for this question. Your subr·78 ·ans: Computed value 7O 7 Saturday, September 29 t 4 Fack Correct! 3) (c) How much heat does it give off in each cycle? You currently have 2 submissions for this question. Only You can make 8 more submissions for this question. 24 22 10 submission are allowed. Your subr2422 ns: Computed value 24 22 Femack Correct Submitted Saturday, September 29 t 443 PM (d) What is the coefficient of performance of this engine when it works as a refrigerator between these two reservoirs? 1.34 You currently have 1 submissions for this question. Only 10 submission are allowed You can make 9 more submissions for this question. Your subr ns: Computed vlu 134 Sudmund Strow. Septeneer 29 4 41 PM

Explanation / Answer

A)

Efficiency, n = 1 - (Tc/Th) = 1 - (78/306) = 74.51 %

B)

Work done, W = n Qh = 0.7451 x 95 = 70.78 J

C)

Using law of conservation of energy

|Q| = Qh - W = 95 - 70.78 = 24.22 J

D)

Cop = 78/(306 - 78) = 0.342

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