1. Not finding help here? Sign up for a free 30min 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!

Heat transfer from cooling lava

  1. Dec 4, 2013 #1
    1. The problem statement, all variables and given/known data
    The world's most active volcanos, such as the Kilauea volcano in Hawaii, can disgorge about 5 ✕ 105 m3 of 1000°C lava per day. What is the rate of heat transfer out of the earth by convection if this lava has a density of 2800 kg/m3 and eventually cools to 32°C? Assume that the specific heat of lava is the same as that of granite. Answer in MW.


    2. Relevant equations
    D=m/v
    Q=mc(tf-ti)
    P = Q/t



    3. The attempt at a solution

    Solved the density equation for mass (m=1.4*10E9kg)
    Solved for Q (Q=1.07*10E15J)
    Solved for P (P=1.24*10E10W or 12400MW)

    Followed an example from book, what am I missing
     
  2. jcsd
  3. Dec 5, 2013 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    I take it your answer has been marked wrong. I get 12390MW, so I would probably have been marked wrong too.
     
  4. Dec 5, 2013 #3
    Thanks for trying
     
  5. Dec 5, 2013 #4
    What about the heat of solidification?
     
  6. Dec 5, 2013 #5
    Thanks chestermiller been searching for fusion number for granite found 100cal/gm can anyone verify
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted