Normal human skin and clothing temperature indoors is approximately 30 o C. In order to maintain this temperature, one student sitting in a classroom gives off heat at a rate of 14 watts per degree K in temperature difference between the person and the room. If the room is kept at 21 o C and there are 100 students in the classroom, how much heat is added to the room during a 50-minute class,
a. in units of kJ?
b. in units of kwh?