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22 August, 13:26

An ice cube placed in microwave melts in five minutes and it takes 3.50 kj of energy to melt it. what is the power of the microwave?

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  1. 22 August, 13:44
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    If the ice absorbed 350,000 joules in 5 minutes, then it absorbed energy

    at the rate of

    (350,000 joules) / (5 x 60 seconds) = 1,166-2/3 watts.

    Surely the ice cube didn't absorb every joule delivered to the cooking chamber,

    so the microwave oven's cooking power had to be significantly more than that.
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