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: Cooling rate of an asteroid.

  1. Mar 26, 2008 #1
    Consider an asteroid with an iron core (pc = 8000kg/m^3) covered by a thin silicate mantle (pm = 3400kg/m^3) with a thickness of 20% of the radius R of the asteroid. Assume that the internal temperature Ti = 600K is constant throughout the core. The thermal energy of the core is 3*k*Ti per atom(where k is Boltzmann's constant) and assume that the thermal conductivity of the silicate mantle is about kc = 2 W/ (m*K). Ignore the heat capacity of the mantle. If the surface of the asteroid has a temperature of Ts = 200K find the value of R such that the asteroid has a cooling rate of 1 K / 1 million years.

    I really don't know where to start with this question. Any help would be appreciated.
  2. jcsd
  3. Jun 11, 2008 #2
    i get the exactly same question...

    i dont know how to solve it either...

    have you already got the answer yet?
    if you have, could you give me some hint?
    please email me jaywang19880830@gmail.com
  4. Jun 11, 2008 #3


    User Avatar
    Gold Member

    Well, a good start would be to rewrite this homework question as per the homework posting guidelines.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook