- #1

MaestroBach

- 49

- 4

Moved from a technical forum, so homework template missing.

**Summary:**Apparently an ice cube gains mass when it melts

So I'm asked to "Find the fractional increase in inertial mass when an ice cube melts ".

All I've got off the top of my head right now is that a cube has energy = mc^2, and then when the cube melts, energy Q = (Heat of fusion)(m) is added, so the energy of the liquid is Q + mc^2. I think, technically, what my professor wants me to use is mass dilation, so the liquid and mass will have the same energy I guess? (Which is funny because I remember him saying we wouldn't be using mass dilation, saying "we just don't do that anymore").

I'm not sure how to change what I have in terms of energies into an expression relating masses. I know there's a mass dilation equation, but it's not like the liquid is moving... and I assumed the net average velocity of all the water molecules was 0, maybe I'm wrong and it has something to do with that.

Any help would be appreciated!