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hw_1 - Temple University Dept of Mechanical Engineering...

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Unformatted text preview: Temple University Dept. of Mechanical Engineering Fall 2008 ET 3532/ ENGR 3571 Thermodynamics HOMEWORK 1 Chapter 1 1. Youdive5mdownintheocean.Whatistheabsolutepressurethere? 2. Alaboratoryroomkeepsavacuumof0.1kPa.Whatnetforcedoesthatputon thedoorofsize2mby1m? 3. Apressurizedsteelbottleischargedwith5kgofoxygengasand7kgofnitrogen gas.Howmanykmolesareinthebottle? 4. A1200kgcarmovingat20km/hisacceleratedataconstantrateof4m/s2up toaspeedof75km/h.Whataretheforceandtotaltimerequired? 5. A2.5mtallsteelcylinderhasacrosssectionalareaof1.5m2.Atthebottomwith aheightof0.5misliquidwaterontopofwhichisa1mhighlayerofgasoline. Thegasolinesurfaceisexposedtoatmosphericairat101kPa.Whatisthe highestpressureinthewater? Chapter 3 6. IfIhave1Lammoniaatroompressureandtemperature(100kPa,20oC)how muchmassisthat? 7. Waterat120Cwithaqualityof25%hasitstemperatureraised20oCina constantvolumeprocess.Whatisthenewqualityandpressure?DrawPvand Tsdiagrams. 8. Givethephaseforthefollowingstates.(a)CO2T = 267CP = 0.5,(b)AirT = 20CP = 200kPaand(c)NH3T = 170CP = 600kPa.LabelthemontoPvand Tsdiagrams. 9. Give the phase and the missing property of P, T, v and x. Put the values in a table with columns P, T, v, and x. a. R-134a T = -20 C, P = 150 kPa b. R-134a P = 300 kPa, v = 0.072 m3/kg c. CH4 T = 155 K, v = 0.04 m3/kg d. CH4 T = 350 K, v = 0.25 m3/kg 10. Youwantapotofwatertoboilat105C.Howheavyalidshouldyouputonthe 15cmdiameterpotwhenPatm=101kPa? 11. Aglassiscleanedin45Chotwaterandplacedonthetablebottomup.The roomairat20Cthatwastrappedintheglassgetsheatedupto40Candsome ofitleaksoutsothenetresultingpressureinsideis2kPaaboveambient pressureof101kPa.Nowtheglassandtheairinsidecoolsdowntoroom temperature.Whatisthepressureinsidetheglass? 12. Determine whether water at each of the following states is a compressed liquid, a superheated vapor, or a mixture of saturated liquid and vapor. A) P = 10 MPa, v = 0.003 m3/kg, B) 1 MPa, 190C, (C) 200C, 0.1 m3/kg and D) 10 kPa, 10C. Label themontoPvandTsdiagrams. 13. Use a linear interpolation to estimate properties of ammonia to fill out the table below. a) b) c) P [kPa] 550 80 T [ C] 20 10 v [m3/kg] 0.4 x 0.75 ...
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