A certain amount of ice is supplied heat at a constant rate for 7 minutes. For the first 1 minute, the temperature rises uniformly with time, then it remains constant for the next 4 minute and again rises at a uniform rate for the last 2 minutes. Explain physically these observations and calculate the final temperature. Latent heat of ice = 336 × 10 3 J kg –1 and c water = 4200 J kg –1 K –1 .
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Sol. In the first interval of 1 min ice is heated to its melting point from its initial temperature
which is below the melting point. In the next 4 min there is phase change. In the next 2 minutes there is heating of water let 
be the rate of supply of heat in joule per minute
On dividing 
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