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Change in entropy Problem

  1. Nov 16, 2005 #1
    This question buzz my head :cry: Plz help
    A mass of water (mass m=5kg, specific heat capacity at constant pressure: Cp=4184j/kg*C) initially in thermal equilibrium with the atmosphere at 20 degree celcius, is cooled at constant pressure to 4 degree celcius by means of heat pumps operating between water & atmosphere. What is the minimum work required? :confused:
    The hint for this question is that using the change in entropy, but how???
     
    Last edited: Nov 16, 2005
  2. jcsd
  3. Nov 16, 2005 #2

    GCT

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    what is the expression for constant pressure entropy change?
     
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