Question

Quenching’ is a process used to change the properties of steel by cooling it rapidly.
The steel is heated to a very high temperature and then placed in a container of cold water.
(i) A metalworker quenches a steel rod by heating it to a temperature of 900 °C before
placing it in cold water. The mass of the steel rod is 20 kg.
The final temperature of the rod and water is 50 °C.
Calculate the energy transferred from the steel rod to the water.
Specific heat capacity of steel = 420 J / kg °C.
Use the correct equation from the Physics Equations Sheet.
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Energy transferred = ........................................ J
(3)
(ii) The temperature of the steel rod eventually returns to room temperature.
Compare the movement and energies of the particles in the steel rod and in the air at
room temperature.

only 2nd question needs to be answered but first part provided for context

Answer 1

Answer:

when the steel rod is room temperature, no heat will move between the room and the steel rod, but the steel rod and the room will still radiate infared radiation.