1.

3. 1.0 kg of water is contained in a 1.25 kW kettle.Calculate the time taken for the temperature of waterto rise from 25°C to its boiling point 100°C. Specificheat capacity of water -4.2 J g1 K-1.Ans. 4 min 12 s

Answer»

Let the time taken is t

heat loss by kettle = heat gain by water 1.25 × 10³ × t = Q = mC∆T C is the specific heat capacity of water e.g., C = 42J/Kg/K∆T = (100 - 25)°C1250 × t = 1 × 4200× ( 100 - 25) 1250 × t = 4200 × 75 50t = 12600 t = 1260/5 = 252 sec



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