A 1 kW electric kettle contains 2 litre water at 27°C. The kettle is operated for 10 minutes. If heat is lost to the s
constant rate of 160 J/sec the temperature attained by water in 10 minutes will be (specific heat of water = 4.2k
(A) 57°C
(B) 67°C
(C)
770 C
(D) 87°C
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The answer is a option C
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A kettle with 2 litre water at 27∘C is heated by operating coil heater of power 1 kW. The heat is lost to the atmosphere at constant rate 160J/s, when its lid is open. In how much time will water heated to 77∘C with the lid open ? (specific heat of water = 4.2kJ/∘C-kg) ∴Time required =QP=500s=8min20s.
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