PHY 1200 Midterm: PHYS 1220 Exam 1 Fall 2010
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You can choose 4 out of 5, or lowest score will be dropped if you complete all of them). Use si units to express your results: consider two metal rods, one copper (kcu=385 w/mk) and one aluminum (kal=205 w/mk). Both have a diameter d=3cm, and length l=20cm . They are arranged in parallel as shown in the figure below. , where th=100 c; tc=20 c. Find: the thermal current carried by each rod, the total thermal current, the equivalent thermal conductivity for the two rods combined. The mass of the calorimeter is 150g. ccu=390 j/kg k, cwater=4190j/kgk, cice=2100j/kgk, lfusion=334x103j/kg, Lvapor=2256x103j/kg: a mono-atomic ideal gas (cv=1. 5r, =1. 67) expands adiabatically from a volume of 2 liters to 4 liters. The initial temperature is 27 c, and the initial pressure is 1atm. It undergoes the following cycle: it looses 90j of heat at constant volume. Justify your answer: consider the carnot heat engine depicted in the figure.
