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13 May, 07:43

how long does it take a 750watt heater operating at full rating to rais the temperature of 1kg of water From 40°C to 70°C {S. H. C=4200j/kg/k and neglecte heat loss}

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  1. 13 May, 07:46
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    168 seconds (2 min 48 s)

    Explanation:

    Find the heat absorbed by the water.

    q = mCΔT

    q = (1 kg) (4200 J/kg/K) (70°C - 40°C)

    q = 126,000 J

    Power is energy per time.

    P = q / t

    750 W = 126,000 J / t

    t = 168 s

    It takes 168 seconds (2 min 48 s).
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