Problem D3:
You have 100 grams of a fluid that is initially at a temperature n_{1}.
The specific heat capacity of the fluid is C_{0}. You have 60 grams of
a solid that is initially at a temperature of n_{2}. The specific heat
capacity of the solid is C_{0}/3. You now place the solid into the
liquid and the system comes to thermal equilibrium at a temperature of
n_{3}. What is n_{3}?
Note that n_{1}, n_{2}, and n_{3} are all in the same
temperature units.

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