(b) Quenching is a process used to change the properties of steel by rapidly cooling it
During the quenching process, the steel is heated to a very high temperature and
then placed in a container of cold water.
A steel rod is quenched by heating it to a temperature of 815 °C before placing it in
cold water.
The mass of the steel rod is 15 kg.
The final temperature of the rod and water is 60 °C.
Calculate the energy transferred from the steel rod to the water.
Use the correct equation from the Physics Equation Sheet.
Specific heat capacity of steel = 490 J/kg °C.
Give the answer to two significant figures.
[3 marks]