Homework 3, due Mon April 18, 2011
		Physics 12: Spring 2011

Ristinen and Kraushaar, Chap 2: Multiple Choice: 6,7,10,11
Ristinen and Kraushaar, Chap 3: Questions and Problems: 1,4,15
Ristinen and Kraushaar, Chap 3: Multiple Choice: 8,11,12,16,17,18,21

1.  Make rough estimates (from class notes or elsewhere) of the amount of
oil (in barrels), coal (in tons), and natural gas (in Tcf) left in the world.
Convert these numbers into QBtu, boe (barrels of oil equivalent), and
TWyears (Tera Watt years). 

2. From the above estimate how long each of the above resources would last if
the entire U.S. energy usage came from that source.  (Use 100 QBtu/year
as current U.S. energy usage).