The Popeye Frozen Company freezes its spinach by first compressing it into large slabs (1-D wall) and then sends them through a Nitrogen bath at -90%uF0B0C. The slab of the compressed spinach is initially at 20C; it must be reduced to a temperature of -34C or below. The temperature at any part of the slab, however, must never drop below -51C to prevent permanent damage to the spinach. Assume it is a onedimensional transient conduction problem. Popeye has called you in to estimate the maximum thickness of the spinach slab which satisfies the temperature requirements at 60 minutes. Also determine the heat transfer coefficients of the convection environment to satisfy the temperature requirements. The properties of spinach may be taken to be: k=1.731 W/mK, density=961.1 kg/m3, C=2100 J/kgK