A person brings a cup of hot chocolate (170°F) into a room (65°F) and places a metal spoon (65°F) into the hot chocolate.?

Question

anonymous · Answer

What happens to the temperatures of the hot chocolate, the spoon, and the air in the room after 10 minutes?

Which type of heat transfer is being used?
A)Convection
B)Radiation
C)Conduction

At what point will the net transfer of heat energy stop?

anonymous · Answer

Can somebody help me?

anonymous · Answer

Well I know that conduction is essentially the transfer of heat without movement. Convection is heat transfer through motion of liquids. And radiation Is heat by electromagnetic radiation.

matt101 · Answer

By the Zeroth Law of Thermodynamics, heat will flow from the hot chocolate into the spoon and the room since heat spontaneously moves from hotter to colder areas until all are the same temperature. So...the temperature of the hot chocolate will go down while the temperature of the spoon and the room will go up.

In this case, convection is mainly being used, because the movement of a fluid (either the air or the hot chocolate itself) is causing the heat transfer to occur. Although truthfully, all three processes are occurring to some extent.

The net transfer will stop once the system has reached thermal equilibrium (i.e. everything is at the same transfer).