(a)[4]
Explain how thermal energy from the heating element is transferred to all the water in the kettle.
(b(i))[2]
A student puts hot water into each can. The initial temperature of the water is 85 ^{\circ}C. The student measures the temperature of the water in both cans every 30 seconds for 10 minutes. Suggest which can of water will cool more quickly. Give a reason for your answer.
(b(ii))[4]
Suggest and explain two changes to can B that lower thermal energy loss to the surroundings.