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Transcript
Che111:Chapter7PracticeProblems 1. Thesimplestdefinitionof_energy_________isthatitisthecapacitytodowork.Work, inthiscontext,maybedefinedaswhatisdonetomoveanobjectagainstsomesortof ___resistance___. 2. Thecapacitytodoworkresultingfromthe___motion__ofanobjectiscalledkinetic energy,KE. 3. TheLawofConservationofEnergystatesthatenergycanbeneither_created__nor ___destroyed___,butitcanbe__transferred_fromonesystemtoanotherand __change____fromoneformtoanother 4. Potentialenergy(PE)isa(n)__stored__formofenergyanobjectpossessebyvirtueof its___position___. 5. Achangethatleadsto___heat___energybeingreleasedfromthesystemtothe surroundingsiscalledexothermic. 6. Foreachofthefollowingchanges,describewhether (1)kineticenergyisbeingconvertedintopotentialenergy, (2)potentialenergyisbeingconvertedintokineticenergy,or (3)kineticenergyistransferredfromoneobjecttoanother. (Morethanoneofthesechangesmaybeoccurring.) a) Acarinanoldwoodenrollercoasterisslowlydraggedupasteepinclinetothe topofthefirstbigdrop.(1) b) Afterthecarpassesthepeakofthefirsthill,itfallsdownthebacksideathigh speed.(2) c) Asitgoesdownthehill,thecarmakesthewholewoodenstructureshake.(3) d) Bythetimethecarreachesthebottomofthefirstdrop,itismovingfastenough togouptothetopofthenextsmallerhillonitsown.(1) e) Windturnsthearmsofawindmill.(3) f) Thewindmillpumpswaterfrombelowthegroundupintoastoragetankatthe topofahill.(3),(1) 7. Classifyeachofthefollowingchangesasexothermicorendothermic. a. Thenuclearreactionthattakesplaceinanuclearelectricalgeneratingplant. exothermic b. Cookinganegginboilingwater. endothermic c. Thebreakdownofplasticinthehotsun. endothermic
