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Homework Help: How long does it take the Sun to melt a block of ice

  1. Dec 3, 2008 #1
    1. The problem statement, all variables and given/known data
    How long does it take the Sun to melt a block of ice at 0 celcius with a flat horizontal area 1.0 m^2 and thickness 1.0 cm ? Assume that the Sun's rays make an angle of 30 with the vertical and that the emissivity of ice is 0.050.

    2. Relevant equations

    delta [Q] / delta [t] = (1000W/m^2)(emissivity)A(cos theta)

    3. The attempt at a solution

    delta [Q] / delta [t] = 1000(.05)(cos30)

    I know that this does not give me time. I dont know how to manipulate this equation..please help . Thanks!
  2. jcsd
  3. Dec 3, 2008 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Re: radiation

    What should ΔQ be, in order to melt a block of ice of the given volume?
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