2 reservoirs, one at 100°C and the other at 0°C are connected so that heat is transfered by conduction between them.
After a certain time the hot reservoir transfered 20000 cal.
Calculate the change of entropy of the Universe.

My attempt : As there is only mention of 2 reservoirs, I can assume that the Universe is these 2 reservoirs.
[LaTeX Error: Can't write to directory].
I'm totally stuck, I thought a lot about it. I know that [LaTeX Error: Can't write to directory], but I don't know the material within the reservoirs.
They ask for a numerical value... I can't keep m, c or anything else that is not a number.
I need a push in the right direction. Thanks in advance.

__________________
Isaac
If the problem is too hard just let the Universe solve it.

Nevermind, I asked a professor today and he told me I had to consider that the reservoirs are infinitely large so that their temperatures don't change with time and I can very simply calculate the change of entropy of the Universe.

__________________
Isaac
If the problem is too hard just let the Universe solve it.