Physics - Heat & Thermo Question with Solution | TestHub

An ice block at $0^{\circ }\mathrm{C}$ and of mass m is dropped from height ' h ' such that the loss in gravitational potential energy of block is exactly equal to the heat required to just completely melt the ice. Taking latent heat of fusion of ice $=80\mathrm{cal}/\mathrm{gm}$, acceleration due to gravity $=10\mathrm{m}/{\mathrm{s}}^2$ and mechanical equivalent of heat $=4.2\mathrm{J}/\mathrm{Cal}$. The value of ' h ' is