Hot Air in a Physics Leeture
(a) A typical student listening attentively to a physics lecture has a heat output of 100 W. How much heat energy does a class of 90 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 10201/kg K and density 1.20 kg/m3.1f 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?