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Homework Help: Heat required to melt an iceberg

  1. Nov 16, 2007 #1
    1. The problem statement, all variables and given/known data

    I think I'm doing this problem correctly... I'm not sure about my change in temperature value. Any suggestions?

    Icebergs in the North Atlantic present hazards to shipping, causing the length of shipping routes to increase by about 30 percent during the iceberg season. Attempts to destroy icebergs include planting explosives, bombing, torpedoing, shelling, ramming, and painting with lampblack. Suppose that direct melting of the iceberg, by placing heat sources in the ice, is tried. How much heat is required to melt 12 percent of a 1.30×105 metric-ton iceberg? One metric ton is equal to 103 kg. Assume that the iceberg is at 0°C. (Note: To appreciate the magnitude of this energy, compare your answer to the Hiroshima atomic bomb which had an energy equivalent to about 15,000 tons of TNT, representing an energy of about 6.0×1013 J.)

    2. Relevant equations

    Q = c*m*change in temperature

    3. The attempt at a solution

    Miceberg = 1.30E8 kg
    12% of iceberg = 1.56E7 kg
    C ice = 2.00E3

    Q = 2.00E3 * 1.30E8 * 1

    Q = 3.12 E 5 J
  2. jcsd
  3. Nov 16, 2007 #2


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  4. Nov 16, 2007 #3
    Ah... thank you
  5. Nov 16, 2007 #4
    Youre using the wrong equation. Like has been stated, its a phase change and the formula would be [tex]Q = m L_{f}[/tex] where [tex]L_{f}[/tex] is the latent heat of fusion for water. IIRC its around 80 kcal/kg for water.
    Last edited: Nov 16, 2007
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