# Comparison of internal energies: hot nail versus beaker of water

1. Oct 29, 2016

### memeningful

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

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. Oct 29, 2016

### Hamal_Arietis

i) I think nail .
iii) <W>~T because temperature of nail is higher than water.

3. Oct 29, 2016

### CWatters

Have a think about the factors that effect the internal energy. It's not just the temperature.

4. Oct 29, 2016

### Hamal_Arietis

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. Oct 29, 2016

### CWatters

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?