Question

(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?

Answer 1