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Homework Help: Thermodynamics Heat Radiation Problem

  1. Jun 24, 2013 #1
    Hi everyone, I am unsure about how to solve this problem. I believe i have the right equation but I'm confused about how I can find Q/T with the information I am given. Is there another equation I can use?

    1. The problem statement, all variables and given/known data

    Assume the steel in the body of an automobile has an emissivity of 0.3 and a
    specific heat of 450 J/Kg-degreeC. Take the area of the hood of the
    automobile directly exposed to the sun as 3.5 square meters, and its mass
    as 24.0 kg. What temperature will the top of the hood reach, assuming it
    lost heat by radiating to its surrounding environment, which is at 20 degreesC?

    2. Relevant equations

    Q/T= eθA(T1^4-T2^4)
    θ (Stefan-Boltzmann Constant) = 5.67 x 10^-8

    3. The attempt at a solution

    Q/T = (0.30)(5.67x10^-8 w/M2-K4)(3.5M2)[(T1^4-293.15^4 K)

    I am searching for T1, anyone know how I can find Q/T? Maybe from another equation but I'm not sure which one.

    Any help is appreciated, thank you!
    Last edited: Jun 24, 2013
  2. jcsd
  3. Jun 25, 2013 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    There seems to be missing info re the power of the sunlight.
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