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A string in hanging on a block of ice with a $20$ cm width. On both sides of the string there is a weight M$.$ The temperature of the ice is $-2$ and it under $1$ pressure. The molar Enthalpy of melting is $=6$ and its independent of the pressure. The molar volume of the ice is $19\mathrm{.}663/$ and the liquid water density at $0$ is $1/.$ What will be the mass of weights M $($in Kg$)$ in order for the string to cut through the ice.