calculate the time taken to raise the temperature of 1.5 kg of water in a kettle from 15°C to 100°C given that specific heat capacity of wat

Question

calculate the time taken to raise the temperature of 1.5 kg of water in a kettle from 15°C to 100°C given that specific heat capacity of water is 4200 J/kg/K and the heater is rated 250V , 2kW​

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Kiệt Gia 3 years 2021-08-25T01:39:26+00:00 1 Answers 7 views 0

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    2021-08-25T01:40:54+00:00

    Answer:

    270 s or 4.5 min

    Explanation:

    First find the amount of heat needed:

    q = mCΔT

    q = (1.5 kg) (4200 J/kg/K) (100 − 15) K

    q = 535,500 J

    q = 535.5 kJ

    Power is energy per time.

    P = E / t

    2 kW = 535.5 kJ / t

    t = 270 s

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