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Homework Help: General Physics Problem

  1. Mar 26, 2004 #1
    I have a simple physics problem I'm not sure how to solve.

    A child builds a big snowman which contains 50kg of snow. How much energy would it take to melt it from an initial temperature of -2 degrees Celsius?
  2. jcsd
  3. Mar 26, 2004 #2

    Doc Al

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    Staff: Mentor

    Solve it in two steps. First find the heat needed to raise the temperature of the ice from -2 to 0 degrees C:
    [tex]Q_1 = mc_{ice}\Delta t[/tex] ([tex]c_{ice}[/tex] is the specific heat of ice/snow)
    Then find the heat needed to melt the ice:
    [tex]Q_2 = mL_{water}[/tex] ([tex]L_{water}[/tex] is the latent heat of fusion for water-ice)
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