Question

10 kg water falls through a distance of 854m and all the energy is effective in heating the water.To what temperature will the water be raised if it was initially at 20c?

Answer 1

$mgh=cm\Delta t,$

$gh=c(t_2-t_1),$

$t_2=t_1+\frac{gh}{c},$

$t_2=20+\frac{9.8\cdot 854}{4200}=22°C.$