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Homework Help: Newton's cooling law

  1. Jun 5, 2007 #1
    1. The problem statement, all variables and given/known data
    "A cup of hot chocolate, in a room temperature of 21*C, cools accordiing to Newton's law of cooling. Determine the rate of cooling, k, of the hot chocolate if it cools from 86*C to 65*C in 15 minutes"

    2. Relevant equations
    Newton's cooling law, ln function
    T-Ts=(T. - Ts)e^(kt)

    3. The attempt at a solution

    T-Ts=(T. - Ts)e^(kt)
    Is this right?
  2. jcsd
  3. Jun 5, 2007 #2
    were you taught this formula or the differential equation?

    it's right btw
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