NEET | 2016CalorimetryEasy

Question

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 gets converted into heat during its fall. The value of h is:
[Latent heat of ice is 3.4 × 15 J/kg and g = 10 N/kg]

Options

A.

34 km

B.

544 km

C.

136 km

D.

68 km

Solution

14mgh = mL
h = 4Lg=4×3.4×10510=13.6×104
= 136 × 103 km
= 136 km

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