Suppose that you have left a 200-ml cup of coffee sitting until it has cooled to 30∘c , which you find totally unacceptable. your microwave oven draws 1100 w of electrical power when it is running. if it takes 45 s for this microwave oven to raise the temperature of the coffee to 60∘c , what is the efficiency of heating with this oven?

Explanation:

Considering the density & specific heat capacity of coffee to be equal to that of water.

GIVEN:

density specific heat mass of coffee, initial temperature of coffee, final temperature of coffee, power rating of oven, time taken to reach the final temperature,

Heat released by the coffee to come to 60°C:

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Now the energy used by the oven in the given time:

Now the efficiency:

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