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Homework Help: Determining the change in temperature

  1. Feb 7, 2010 #1
    1. The problem statement, all variables and given/known data

    A person sitting in a room has a heat output of 200W. Please calculate...

    A) How much energy does a room of 45 people release over a course of 1 hour?
    B) Assuming that all the energy in part a is transferred to a room of 300 M^3 of air. The air has a specific heat capacity of 1020 J/KxKg and density of 1.20. If none of the heat escapes, how much will the temperature change over time of 50 minutes?

    2. Relevant equations

    3. The attempt at a solution

    For part A I found that the energy would be 45x200x3600 seconds = 3.24 x 10^7

    For part B however, I tried to determine the mass by rearranging the density formula, multiplying density by volume. using that number in Q=Mc (delta T), and rearranging the formula, i get a change of around 60 Kelvin. But I know that can't be right...What am I doing wrong?
  2. jcsd
  3. Feb 7, 2010 #2


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    Science Advisor
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    Can you show us exactly how you got the temperature change to be 60 K? Then maybe we could figure out what you are doing wrong.
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