Define frozen solid, Physics

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Define Frozen Solid (Moscow Phys-Tech)?

Evaluation how long it will take for a small pond of average depth D=0.5 m to   freeze entirely   in   a   very cold winter, when   the temperature   is   forever below the freezing point of water. Take the thermal conductivity   of   ice   to   be k=2.2 w/m k, the latent   heat   of   fusion q=3.4.105 J/kg, and   the   density p=0.9.103kg/m3. Acquire the outside temperature   to   be   a constant T0=263K.

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