(a) A typical student listening attentively to a
physics lecture class has a heat output of
100 W. How much heat energy does a class of 80 physics students release into a
lecture hall over the course of a 50-min lecture?
(b) Assume that all the heat energy in part (a) is transferred to the 3200 m3 of air in the
room. The air has specific heat capacity 1020 J/kg-K and density 1.20 kg/m3. If
none of the heat escapes and the air conditioning system is off, how much will the
temperature of the air in the room rise during the 50-min lecture?
(c) If the class is taking an exam, the heat output per student rises to 280 W. What is the
temperature rise during 50 min in this case?
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