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Comparison of internal energies: hot nail versus beaker of water

  1. Oct 29, 2016 #1
    1. The problem statement, all variables and given/known data

    A nail is heated in a bunsen burner flame and is about to be dropped into a beaker of water at room temperature.

    a) Which of the two substances (nail or water) would you expect to initially have:

    i) the highest internal energy
    ii) the highest average kinetic energy


    2. Relevant equations


    3. The attempt at a solution

    for my answer
    i) the highest internal energy (to me, it was nail)
    ii) the highest average kinetic energy (to me, it was water)

    I checked the answers, my logic is wrong, so I have decided to come here to ask why and the reasons


    Thanks everyone!
     
  2. jcsd
  3. Oct 29, 2016 #2
    i) I think nail .
    iii) <W>~T because temperature of nail is higher than water.
     
  4. Oct 29, 2016 #3

    CWatters

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    Have a think about the factors that effect the internal energy. It's not just the temperature.
     
  5. Oct 29, 2016 #4
    I think the factors that effect the internal energy are the temperature and the degrees of freedoms. Metal has 6 degrees of freedom. I dont know about the liquid.
     
  6. Oct 29, 2016 #5

    CWatters

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    The energy required to heat something up depends on three things. The Temperature change is one.

    Would it make a difference if it was an ocean of water?
    What would make a difference if the mass and temperature of the two objects were was the same?
     
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