Water of volume 2 litre in a container is heated with a coil of 1 kW at 27°C. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27°C to 77°C? [Given specific heat of water is 4.2 kJ/kg] (a) 8 min 20 s (b) 6 min 2 s (c) 7 min (d) 14 min

 

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Water of volume 2 litre in a container is heated with a coil of

1 kW at 27°C. The lid of the container is open and energy

dissipates at rate of 160 J/s. In how much time temperature

will rise from 27°C to 77°C? [Given specific heat of water is

4.2 kJ/kg]

(a) 8 min 20 s (b) 6 min 2 s

(c) 7 min (d) 14 min

Answer: a