General Thermal/Energy Physics Problem

[Timiop2008]

The Plug of a new steel, electric kettle says "power rating 2.5W"

a) The metal wall of the kettle and the water inside the kettle always remain close to thermal equilibrium, even when the water boils. Explain how this is true.

b) The kettle uses 300J to raise its temperature by 1 Kelvin. 0.75Kg of water with specific heat capacity 4200 JKgK is heated from 20'C to 100'C. Calculate the energy transferred during the process and state two assumptions you have made.

c) Calculate the time the process takes

 

[Stonebridge]

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