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Question
A block of ice with mass m falls into a lake. After impact, a mass of ice m/5 melts. Both the block of ice and the lake have a temperature of 0∘C. If L represents the heat of fusion, the minimum distance the ice fell before striking the surface is :
A block of ice with mass m falls into a lake. After impact, a mass of ice m/5 melts. Both the block of ice and the lake have a temperature of 0∘C. If L represents the heat of fusion, the minimum distance the ice fell before striking the surface is :
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Solution
The correct option is A L5g
Let it fall from h height.
When mass m of ice will fall over lake its potential energy will change to heat energy, and that heat will melt ice.
mgh=mL/5, (Potential energy to latent heat energy)
so, h=L/5g
Let it fall from h height.
When mass m of ice will fall over lake its potential energy will change to heat energy, and that heat will melt ice.
mgh=mL/5, (Potential energy to latent heat energy)
so, h=L/5g
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melts. Both the block of ice and the lake have a temperature of 00. If L represents the latent heat of fusion, the distance the ice falls before striking the surface is.