Fa06-MT1-Packard-Exam

# Fa06-MT1-Packard-Exam - Physics 7b Fall 2006 Midterm 1 R...

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Physics 7b Fall 2006 Midterm 1 R. Packard Work all problems. Introduce and clearly define algebraic symbols to represent all physical quantities. Do not perform numerical work until you have a final algebraic answer within a box . Check the dimensions of your answer before inserting numbers. Work the easiest parts first, and the next hardest, etc. If you do not understand the question ask the proctor for assistance. All problems are weighted equally. k B =1.38x10 -23 J/K, N A =6.02x10 23 , latent heat of fusion of water 3.3x10 5 J/kg, specific heat of ice, 2100J/kgC o , specific heat of liquid water 4186J/kgC o , σ =5.6x10 -8 W/m 2 K 4 When considering gas processes you may assume the gas follows the ideal gas law. _________________________________________________________ Name________________________________________ SID_________________________________________ Sect. # or day and time __________________________ TA name (if known)_______________________________ 1._____ 2._____ 3._____ 4._____ 5._____ Total______

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Problems 1,2, and 3 all are based on the same “house” described in problem 1. 1. Consider a house with a square “footprint” (i.e. base) 10m on each side and height 5m. Air is ~80% N 2 with a molecular weight M W =28g/mole a. (5pts) Estimate how many air molecules fill the interior space of the house

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