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Radiation and temperature time

  1. Jul 18, 2009 #1
    1. The problem statement, all variables and given/known data

    The Earth intercepts 1.27 ´ 1017 W of radiant energy from the Sun. Suppose the Earth, of volume 1.08 ´ 1021 m3, was composed of water. How long would it take for the Earth at 0°C to reach 100°C, if none of the energy was radiated or reflected back out into space?

    no clue how to start.
    what formulas are related to this problem
     
  2. jcsd
  3. Jul 18, 2009 #2

    Redbelly98

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    What formulas has your class studied recently? I would look at those.
     
  4. May 17, 2010 #3
    I'm not entirely sure either. But using Q=cmT to find out the energy needed to heat the water, and then dividing by the intercepted energy.

    Q=4x(1.08x10^26)x100

    =4.32x10^26

    Then divide by the intercepted power. Which converts to J/s.

    The answer comes out wrong though.
     
  5. May 17, 2010 #4

    Redbelly98

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    You used the wrong value of c. Hint: pay attention to units.
     
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