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A piece of ice falls from a height h so ...

A piece of ice falls from a height h so that it melts completely .Only one-quarter of the heat produced is absorbed by the ice and all energy of ice get converted into heat during its fall.The value of h is [Latent heat of ice is `3.4xx10^5 J//K` and `g =10N//Kg`]

A

68km

B

34km

C

544km

D

136km

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How much heat energy is required to melt 5 kg of ice? (Specific latent heat of ice = 336 Jg^(-1) )

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A plate of area 10 cm^2 is to be electroplated with copper (density 9000 kg m^(-3) to a thickness of 10 micrometres on both sides, using a cell of 12 V . Calculate the energy spend by the cell in the process of deposition. If this energy is used to heat 100 g of water, calculate the rise in the temperature of the water. ECE of copper = 3 xx 10^(-7) kg C^(-1) and specific heat capacity of water = 4200 J kg^(-1) K^(-1) .

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The lower surface of a slab of stone of face-area 3600cm^(2) and thickness 10cm is exposed to steam at 100^(@)C . A block of ice at 0^(@)C rests on the upper surface of the slab. 4.8g of ice melts in one hour. Calculate the thermal conductivity of the stone. Latent heat of fusion of ice =3.36 xx 10^(5) J kg^(-1)

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) .

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