EML 5104 Classical Thermodynamics, Spring 2010
Mid Term Test, 3 March 2010
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Problem 1
A piece of metal (0.25 kg), initially at 1100 K, is quenched by immersing it in a rigid, closed tank
containing 20 kg of water, initially at 300 K. The metal and water can be modeled as
incompressible substances with constant specific heats. The specific heat of water is
c
w
=4.2
kJ/(kg K) and the specific heat of the metal is
c
m
=0.45 kJ/(kg K). After some time, the system
reaches thermal equilibrium (
T
w
=
T
m
=
T
∞
).
Hints:
Neglect heat transfer from the tank to the surroundings. Neglect kinetic and potential
effects. Pressure and volume remain constant. Assume
T
0
= 293 K.
a)
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 Spring '08
 Staff
 Thermodynamics, Classical Thermodynamics, water jacket

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