1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Conduction Calculation Help Please

  1. Nov 16, 2007 #1
    1. The problem statement, all variables and given/known data
    A large styrofoam cooler has a surface area of 1.0m^2 and a thickness of 2.5cm. If 5.0kg of ice at 0C is stored inside and the outside temperature is a constant 35C, how long does it take for all the ice to melt? (Consider conduction only)

    2. Relevant equations
    kA(delta)T/d = Q/(delta)T


    3. The attempt at a solution
    I tried (.042J/mxsxC)(1.0m^2)(35C)/.025m = 58.8j/s but I don't think that the change in temperature is correct.

    But after getting that answer solve for Q=(5.0kg)(2100J/kgxC)(35C) = 367500J again i dont think the change in temperature is correct

    Then divide 367000J/58.8j/s = 104.4 hours. which i know is incorrect

    Help would be appreciated thanks
  2. jcsd
  3. Nov 16, 2007 #2


    User Avatar
    Homework Helper

    The cube has 6 surfaces. So the area should be 6.0m^2.
  4. Nov 16, 2007 #3
    the total surface area is 1.0m^2. But I figured it out, I just needed to use the latent heat equation
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook