(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]

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.