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Highschool physics problem

  1. Apr 18, 2012 #1
    1. The problem statement, all variables and given/known data
    2 beakers of water, A and B, initially are at the same temperature. the temperature of the water in A is increased 15°F while at B it increased 15°K. after these temperature changes, which beaker of water has the higher temperature and by how much in °C?


    2. Relevant equations

    I will use the following conversion formulas for °C

    °C=(°F-32)/1.8 (i)

    °C=°K-273 (ii)

    3. The attempt at a solution

    Here's my solution, I'm going to convert the temperature of water beaker A to °C using (i) and for beaker B i will use (ii). is my solution correct?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 18, 2012 #2

    PeterO

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    Homework Helper

    The idea of converting the temperatures to Celcius is admirable, but you don't know either temperature, only by how much they changed.

    I don't think there is a suggestion that one beaker starts at 15°F while the other starts at 15°K.

    Perhaps they both started at 20°C - because they did start at the same temperature.
     
  4. Apr 18, 2012 #3
    thanks for the reply sir! i think, knowing the initial temperature of two beakers is not necessary since what we need to compare is their temperature (in °C) after the said changes.
     
  5. Apr 18, 2012 #4

    PeterO

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    Homework Helper

    That is correct, but you were quoting formulas for converting actual temperatures, not converting changes in temperature.
     
    Last edited: Apr 18, 2012
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