what is the shortest time for which a 2.5kw kettle containing 1.5kg of boiling water can be left without boiling dry? (take the specific latent heat of vaporization of water as 2.26x10^6 j/kg).

1356 s

Explanation:

The total energy that must be supplied to the water to completely boil it is:

where

m = 1.5 kg is the mass of the water

is the specifi latent heat of vaportization of water

Substituting,

The power of the kettle is

And power is defined as the ratio between energy supplied and time:

So, the shortest time the kettle can be left to boil the water is:

c) up

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