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Homework Help: Evaporation from a swimming pool

  1. Apr 23, 2009 #1
    1. The problem statement, all variables and given/known data

    A) How much energy is required to evaporate all the water in a swimming pool of area 119 m2 and depth 2.4 m on a typical summer day? (Please note that the temperature of the water in the lake stays the same.) (For latent heat of vaporization use 2200 kJ/kg.)

    B) The intensity of sunlight is about 1038 W/m2. If all the energy is absorbed by the water in the pool, how long will it take the water to evaporate?

    2. Relevant equations

    I got part A which is 628320000000 J. That is correct. It's part B that I cant solve.

    I know I use I=Q/t and solve for t.

    3. The attempt at a solution

    When i solve for t I get 605317919.1 s.

    Im pretty sure it is in seconds so I convert it to days and i get 7005.99 days.

    THIS ISNT CORRECT!! IDK what im doing wrong..any guidance or input will be greatly appreciated.

  2. jcsd
  3. Apr 23, 2009 #2
    This is incorrect because it is the equation for electrical current. You are given the intensity I = 1038 W/(m^2). Look at the units. What terms are associated with "W" and "m^2"?
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