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# A3 - PHYS 258 Thermal Physics Student ID Assignment 3 Full...

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PHYS 258 - Thermal Physics: Assignment 3 Due Monday January 31 Student ID: Full Name: Score: /12 1. Heat and Work. A liter of air at atmospheric pressure is compressed adiabatically to a pressure of 10 atm. (Air is mostly diatomic nitrogen and oxygen.) [1] (a) Sketch the process on a P-V diagram. [0.5] (b) What is the final volume of this air after compression? [2] (c) How much work is done in compressing the air? [0.5] (d) If the temperature of the air is initially 300 K, what is the temperature after compression?

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2. [3] Heat Capacity and Latent Heat. Your 200-g cup of coffee is boiling-hot. You throw in 50 g of ice to cool it off. Assuming negligible heat leaves the coffee-ice system during this process, what is the final temperature of your coffee? (Assume that the ice is initially at -15 o C. The specific heat capacity of ice is 0.5 cal/g o C , the latent heat of melting is 80 cal/g and heat capacity of water is 1000 cal/kg o C) 3. Thermal Conductivity. Homeowners and builders discuss thermal conductivities in
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A3 - PHYS 258 Thermal Physics Student ID Assignment 3 Full...

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