PHYS 52-03/04 CLOSED BOOK SAMPLE EXAM 3 Spring 2010 1. A brass and a steel bar are both exactly 1.00 m long at a temperature of 20ºC. They are both then heated to 100Cº. Which bar is longer and by how much? (mm) Note: for steel: α = 11E-6 per Cº; for brass: α= 19E-6 per Cº (15 pts) 2. What is the final temperature (Cº) of the resulting liquid water if 10.0 g of steam at 100Cº is mixed with 150 g of water at 20ºC in a thermally insulated container? Assume that for water: The c = 4190 J/kg-K, and heat of vaporization= 2256 J/g (20 pts) 3. The wall of an igloo consists of 0.5 m thick ice covered by an animal skin 5.00 cm thick. If the temperature inside the igloo is 10ºC and outside is – 50ºC and the surface area of the igloo is 25.0m 2 . Assuming the igloo and skin
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