1:56 AM 30% ooooo T-Mobile LTE loncapa.tcc.fl.edu PHY2048 e Messages Courses Hel

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1:56 AM 30% ooooo T-Mobile LTE loncapa.tcc.fl.edu PHY2048 e Messages Courses Help Logout (Spring 2017) Main Menu Contents Grades 4 Li Course Contents HW 27 2 7,8 Timer Notes Evaluate Feedback Print Info 27-6, 7,8 Due in 22 Carnot hours, 2 minutes Engine A Carnot engine works between two heat reservoirs at temperatures Thot 317.0 K and T 216.0 K cold What is its efficiency? Submit Answer Tries 0/15 If it absorbs 195.0 J from the hot reservoir during each cycle, how much work does it do? Submit Answer Tries 0/15 How much heat does it reject during each cycle? Submit Answer Tries 0/15 a Send Feedback Post Discussion

Explanation / Answer

given

Thot = 317 K

Tcold = 216 K

a )

the efficiency is = 1 - Tcold / Thot

= 1 - 216 / 317

= 0.3186

the efficiency is = 31.86 %

b )

the work done is W = the efficiency X Q

= 0.3186 X 195

= 62.127 J

c )

| Qeach | = Q - W

= 195 - 62.127

| Qeach | = 132.873 J

and COP = 132.873 / 62.127

COP = 2.138

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