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Ice melts at the rate of 5 kg per hour i...

Ice melts at the rate of 5 kg per hour in a cold storage when the temperature outside is 300 K. Calculate the minimum power of the motor is to be used to drive a refrigerator to just prevent the melting of ice. Specific latent heat of usion of ice `=3.3 xx 10 ^(5) J kg ^(-1) .[E.Q]`

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`Q _(2) = (Q _(1) - Q _(2)) // T _(2) // ( T_(1) - T _(2)) = 20.98 xx 273//25, m = Q _(2) xx 3600 //L = 2. 48` kg/hour
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Find the number of photons of radiation of frequancy 5xx10^(13)s^(-1) that must be absorbed in order to melt one g ice when the latent heat of fusion of ice is 330J//s .

One end of a steel rod (K=46Js^(-1)m^(-1)C^(-1)) of length 1.0m is kept in ice at 0^(@)C and the other end is kept in boiling water at 100^(@)C . The area of cross section of the rod is 0.04cm^(2) . Assuming no heat loss to the atmosphere, find the mass of the ice melting per second. Latent heat of fusion of ice =3.36xx10^(5)Jkg^(-1) .

If 10 g of ice is added to 40 g of water at 15^(@)C , then the temperature of the mixture is (specific heat of water = 4.2 xx 10^(3) j kg^(-1) K^(-1) , Latent heat of fusion of ice = 3.36 xx 10^(5) j kg^(-1) )

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