PHYS 2101 Lecture : Lecture39
Document Summary
Monday, april 30, 2012: hw 14 due tuesday night may 1, hw 15: optional hw on chapters 19 & 20. Optional means it does not contribute to your nal grade at all. However, working hw 15 will help you review for the nal exam. We will post solutions to hw 15 soon after the hw 14 solutions appear: of ce hours mwf 12:30-1:30 (not wed. this week!, final exam: may 8 5:30-7:30pm. !eint = eint, f " eint,i = q " w. Total mass of ocean water on earth m = !v = 1. 3"10 21kg. Heat transfer by lowering ocean temperature by 1k. Slight problem: this process violates the 2nd law of thermodynamics! You can raise temperature of water by heating it, but cannot get that energy back . Basic idea: the thermal energy in oceans is disordered and cannot be simply converted into useful ordered energy. Irreversible processes: certain processes in nature only go one direction:
