PHYS 258  Thermal Physics:
Assignment 3
Due Monday January 31
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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 PV 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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View Full Document2. [3] Heat Capacity and Latent Heat.
Your 200g cup of coffee is boilinghot. You
throw in 50 g of ice to cool it off. Assuming negligible heat leaves the coffeeice 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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 Winter '11
 YuriLeonenko
 Physics, Thermodynamics, Work, Heat, Heat Transfer, Heat Flow

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