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Newton rate of temp. change

  1. Feb 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A container of hot water at 80°C cools to 79°C in 15 seconds when it is placed in a room that is at 20°C. Use Newton's law of cooling to estimate the time it will take for the container to cool from 70°C to 69°C.
    And still later, from 30°C to 29°C.



    2. Relevant equations
    rate~change in temp.



    3. The attempt at a solution
    15*1.125=18.75 (incorrect)
     
  2. jcsd
  3. Feb 15, 2010 #2

    ehild

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    Homework Helper
    Gold Member

    Look after Newton's law of cooling.

    ehild
     
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