Question

Two sets of flasks are connected by a hollow copper pipe, as shown. Which set will change the temperature most quickly?

Answer 1

Hmm. I'm not 100% sure but. I'm pretty sure it's A because the heated water is below and there's a hotter temp. Also because it's copper, heat will move more quickly. I'm not 100% sure, are there notes you can check?

Answer 2

set A: cold water above hot water

Step-by-step explanation:

The hot water would rise and cold water would sink. This is because hot water is less dense than cold water and would quickly rise and mix with the cold water which would tend to sink. The temperature would change quickly as heat would be transferred from hot to cold till both are in thermal equilibrium.

After a while, in setup B as well, the water would come into thermal equilibrium as water would lose thermal energy to cold water but it will take some time.