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Homework Help: Temperature change problem

  1. Sep 10, 2007 #1
    1. The problem statement, all variables and given/known data
    A person has 300 g of black coffee at temperature 350 K in a vacuum
    flask. 100 g of milk at 280 K are added to the coffee (the flask is immediately closed, so the loss of heat to the air is negligible). Assuming that the specific heat capacities of the coffee and milk are equal, calculate the temperature of the white coffee (black coffee + milk) after the milk has been added.

    2. Relevant equations
    C = Q/ delta T
    T = m1*C1*T1 + m2*C2*T2 / M*C2 + m1*C1

    3. The attempt at a solution

    This is where I am going mad I am not given specific heat capacities thus I have no idea as too how to go about solving this problem.
  2. jcsd
  3. Sep 10, 2007 #2
    If C1=C2, then you can factor all those terms out...
  4. Sep 10, 2007 #3
    thank you
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