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 this fall the value of h is

Answer 1

height=h

latent heat=3.4×10'5 j/kg

g=10N/kg

mgh/4=mLf

h=mLf×4/mg

=Lf×4/g

=3.4×10'5×4/10

=13.6×10'4

=136km

Answer 2

Here : as onlyo ne quarter of heat is absorbed.

Mgh/4=ml

h=4l/g

h=4×3.4×10^5/10

So from here

h=136 km.