A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is…

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 3.4×105 J kg-1 and g=10 N kg-1)
  1. 34  km
  2. 544  km
  3. 136  km
  4. 68  km

Solution

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

Asked in: NEET 2016 (Phase 1)

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