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lecture 5 - kinetic theory

lecture 5 - kinetic theory - Announcements Prayer...

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Announcements 1/14/11 Prayer Monday = MLK holiday Classwide HW average: 59.8% Email from the TA: Mathematica tips, extra  credit papers Two students haven’t registered clickers, are not  getting credit yet. Check your scores! If you are one of these students, please talk to  me ASAP (there’s a registration issue).  a. Bryan Abbott b. Colin Fluckiger
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Worked problems: How much mass does the air in this room  have? (MM   0.029 kg/mol) According to the ideal gas law, what is the  density of air at 300K? At arbitrary T? A hot air balloon is 520 kg (including  passengers). It’s spherical, with radius = 8 m.  The temperature is 300K outside (80.3 ° F). How  hot does the pilot have to get the air inside the  balloon for it to lift off? Some answers: 1.175 kg/m 3 ; 378K (221 ° F)
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Thought quiz (ungraded): In air, the molecular mass of oxygen 
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