Comparison of internal energies: hot nail versus beaker of water

  • #1

Homework Statement


[/B]
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


Homework Equations




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!
 

Answers and Replies

  • #2
156
15
i) I think nail .
iii) <W>~T because temperature of nail is higher than water.
 
  • #3
CWatters
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Have a think about the factors that effect the internal energy. It's not just the temperature.
 
  • #4
156
15
Have a think about the factors that effect the internal energy. It's not just the temperature.
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.
 
  • #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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