How long (in seconds) will it take to heat 40 kg of water from 40°C to 80°C with a 20-kW immersion heater? Assume no energy is lost to the environment and specific heat of water is 4.186 kJ/kgoC.

Total time taken by the heater to raise the temperature of water is 335 s

Explanation:

As we know that the heat required to raise the temperature of water is given as

here we know that

m = 40 kg

s = 4186 J/kg C

now its temperature is raised from 40 degree to 80 degree

so we will have

Now we know that the power of the heater is 20 kW

so total time taken by the heater to raise the temperature of water is given as

answer; ///(74) degrees is your answer..

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