#61 SSM A 5.0 cm slab has formed on an outdoor tank of water Fig. 18-47). The air is at -10"C. Find the rate of ice formation (centime- ters per hour). The ice has thermal conductivity 0.0040 cal/'s - cm - Co Figure 18-47 Prob and density 0.92 g/em'. Assume there is no energy transfer through the walls or bottom