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From what height must a block of ice fal...

From what height must a block of ice fall to just melt by the impact assuming that half of the heat generated is absorbed by ice? (`J=4.2` joules per calories and `L=80` kilocalories per kg)

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The correct Answer is:
68570 m
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From what height must a block of ice be dropped in order that it may melt completely. It is assumed that the whole of energy is retained by ice. Given that latent heat of ice = 80 cal g^(-1) .

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A 55.0 kg ice skater moving at 8.5 m/s glides to a stop. Assuming the ice is at 0^(@)C and that 50 percent of the heat generated by friction is absorbed by the rice, how much ice melts?

A piece of ice falls from a hight h so that it melts completely. Only one quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is : (Latent heat of ice is 3.4xx10^(5) j//kg and g=10N//kg )

With what velocity must a lead bullet at 50^(@)C strike against an obstacle in order that the heat produced by the arrest of the motion, is sufficient of melt it, assuming that all the heat produced remains within the bullet? (Specific heat capacity of lead =31cal kg^(-1)K^(-1) , melting point of lead =335^(@)C , specific latent heat capacity of lead =5370 cal kg^(-1)K^(-1) and J=4.2 joules cal^(-1) )

A 42 kg block of ice moving on rough horizontal surface stops due to friction, after sometime. If the initial velocity of the decelerating block is 4ms^-1 , the mass of ice (in kg) that has melted due to the heat generated by the friction is (Latent heat of ice is 3.36xx10^5Jkg^ -1

An ice block at 0^(@)C is dropped from height 'h' above the ground. What should be the value of 'h' so that it melts completely by the time it reaches the bottom assuming the loss of whole gravitational potential energy is uded as heat by the ice? [Given: L_(f) = 80 cal//gm]

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