4. A copper kettle of mass 1 kg contains 0.9 kg of water at 15°C. It takes 12 minutes to rise the temperature to 95°C. If the electric energy is supplied at 220V, calculate the electric current, assuming 10% of heat is wasted. Given specific heat of copper = 420 J kg-K-1 and specific heat of water = 4200 J kg-1 K-1.
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4. A copper kettle of mass 1 kg contains 0.9 kg of water at 15°C. It takes 12 minutes to rise the te...
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