There are 3 questions on this one and they are not related. The brick wall (of thermal conductivity
0.82 W/m ·
◦ C) of a building has dimensions
of 2.9 m by 8 m and is 12 cm thick.
How much heat flows through the wall in
a 7.6 h period when the average inside and
outside temperatures are, respectively, 26◦C
and 3◦C?
Answer in units of MJ.

Three liquids are at temperatures of 5 ◦C,
21◦C, and 39◦C, respectively. Equal masses of
the first two liquids are mixed, and the equilibrium temperature is 16◦C. Equal masses of
the second and third are then mixed, and the
equilibrium temperature is 27.8
◦C.
Find the equilibrium temperature when
equal masses of the first and third are mixed.
Answer in units of ◦C.

A jar of tea is placed in sunlight until it
reaches an equilibrium temperature of 33.9
◦C .
In an attempt to cool the liquid, which has a
mass of 196 g , 123 g of ice at 0.0
◦C is added.
At the time at which the temperature of the
tea is 29.5
◦C , find the mass of the remaining
ice in the jar. The specific heat of water
is 4186 J/kg ·
◦ C . Assume the specific heat
capacity of the tea to be that of pure liquid
water.
Answer in units of g.

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