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A calorimeter with a heat capacity of 50 cal/°C contains a mixture of 100 g of water and 100 g of ice, in thermal equilibrium. An electric heater of negligible heat capacity(1) is immersed in it and a current of constant power P is passed through it. After 5 minutes the calorimeter contains water at 39.7oC. The latent heat of fusion of ice is 80 cal/g. What is the power (in W) of the heater.
(1)Heat capacity C is defined by C = mc
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